The 4th edition may be a disappointment since the information particularly with respect to your need of design improvements doesn't change.
However, there is a new excellent 2 page article by Mike Priwer included about the subject models of your thread on pages 158 & 159. This is about design change vs. model designation clarification.
Since he also posted the information on this forum, I'll quote it here>
"
The K-frame revolver was introduced in 1899 as the .38 Military, Model 1899. Curiously, it was cataloged as
one gun chambered in three different cartridges: the .38 S&W Special, the .38 US Service Cartridge, and
the .32 Winchester. The two .38 cartridges are the same, as far as this revolver is concerned. The .32 Winchester is a different cartridge ; perhaps because of this difference, it was serial-numbered in its own series. This separation continued until the end of its production, in about 1940.
The .38 Military, Model 1899 was offered in three different barrels lengths: 4", 5", and 6 1/2", and in two different finishes: blue and nickel. The butt configuration was round - as were all the handguns offered by the factory in 1899, except for the single-shot. (By virtue of the extension stocks, the factory felt that this was a square-butt offering, even though the frame was round-butt.) Adjustable target sights were optional. A unique feature of this hand ejector was the lack of a locking point for the end of the extractor rod.
The .38 Military, Model 1902 added the extractor lug under the barrel, and redesigned the extractor rod itself to house a full-length center locking pin, that engaged the lug under the barrel. Otherwise, the gun was identical to the model of 1899. This front locking point was very important to the factory, as it allowed them to distinguish themselves from the other competitors. They secured a patent for this locking arrangement, and that effectively forced Colt to not use a front locking point. In the catalogs and other advertising, Smith & Wesson got a lot of mileage from this feature. The 1902 was offered in the same three calibers, the same three barrel lengths, the same two finishes, and the optional target sights. And, it was offered in round butt frame only, as were all the other catalog offerings.
In October of 1903, the factory made an engineering change that increased the diameter of the threaded portion of the barrel, and simultaneously increased the diameter of the receiver-area of the frame. The factory elected to keep the taper of the barrel the same, so the increased thread diameter brings about the addition of a shoulder on the barrel, at the point where the barrel meets the frame. This has an unintended effect on the patent-date roll markings on the top of the barrel; on the 4" barrels, there is no longer enough flat area in which to place the roll markings, so they are moved to the right side of the barrel. On this short barrel, these markings take three lines, and will remain on the side of the barrel for another 10 or more years.
At this point, the Collectors (circa 1935) want to distinguish this engineering change, and so for Collector purposes, this gun becomes known as the .38 Military Model 1902 1st Change. This change is not noted (by the factory) in the catalogs, but it serves a purpose for Collectors in distinguishing between these two barrel configurations. Again, nothing else changes - but not for long.
It is worth noting that the above-referenced Collectors are, in 1935, the McHenry & Roper book. However, their ideas about the changes are actually coming from the factories internal designations. The factory, internally, is keeping track of the engineering changes, because some of the later-made parts are not compatible with earlier frames. Roper (a factory employee) and McHenry provide and document the methodology that we use today, namely the notions of 1st Change, 2nd Change, etc. This contrasts with the factories preference for keeping engineering changes out of the catalogs, and thereby providing stability for their identified models.
Some time in 1904, the factory introduces a new model - the Model 1905. This revolver features a square butt, but is otherwise the same as its predecessor - the Model 1902. It is available in the same barrel lengths, finishes, etc. More importantly, it has exactly the same internal lockwork as the Model 1902. Like the 1902, it is a 4-screrw frame.
The Collectors (circa 1970) choose to continue categorizing this gun as a Model 1902 1st change, and note that a square butt is now available, along with the original round butt. It’s worth noting that this Model 1905 is now the only square butt frame offering in the catalogs.
About 1905, the factory introduces the first of two significant lockwork changes. The first change is the redesign of the cylinder stop, so that it now has an externally-tensioned spring, secured by the 5th frame screw located in the front of the trigger guard. The Collectors deem this to be an important change, and designate this as the .38 Military, Model 1905. And more so, the Collectors drop the designation of Model 1902. To the Collectors, the .38 Military, Model 1905 represents both round butt and square butt. To the factory, there are two models: the Model 1902 is a round butt, and the Model of 1905 is a square butt.
If the sq butt is a 1905, why isn’t the 1905 w/cyl stop change considered the 1st change?
If the sq butt was a 1902, why isn’t it the 2nd change?
When did the cyl detent end, w/sq butt intro 1904, cyl stop change 1905 or rebound action change 1906?
The second significant change occurs later in the year. The lockwork is dramatically changed, with the introduction of the trigger rebounding slide, which replaces the earlier levering mechanism. This dramatically changes the mechanics of the lockwork, and in fact ultimately becomes the lockwork design for the next 100 years. The factory does not consider this to be a catalog or sales issue, but the Collectors consider it to be very important, and designate these guns as the Model 1905, 1st Change. The factory, of course, does not, and the catalogs still reflect the Model 1902 as round butt, and the Model 1905 as square butt.
At the time of these latest changes, the catalog Model 1905 is still the only square butt offering ; all the other revolvers are round butt. The notion of extension, or target, stocks has been introduced years ago, for the single shot target pistol. These stocks are interchangeable with the .38 single action models of 1880 and 1891, the .38 double action revolvers, and the .32 hand ejector models. All of these are round butt guns, of course; the only square butt is the Model 1905.
In the 1905 catalog, a curious comment appears, in describing the .38 Military, Models 1902
and 1905. This comment is the last sentence in that descriptive paragraph, and it reads:
"Special target stocks applied when desired."
One of the purposes of the earlier-mentioned extension stocks is to effectively fill-out the rounded butt area, converting the stock into something resembling a square butt. This has the effect of augmenting that portion of the grip. Bear in mind that, with the exception of the Model 1905, all the factory offerings are round butt frames. Furthermore, extension stocks are available for several models of these round-butt guns. Clearly, the new Model 1905 already has a square butt, so as far as that is concerned, it would not need special target stocks. In fact, that may have been the reason for the introduction of the square butt Model 1905.
This leads to the conclusion that these "special target stocks" were intended for the Model 1902, which like the Model 1905, was being offered with optional target sights.
The author just happens to have a pair of round-butt K-frame extension stocks, as shown in the following picture. They are nearly identical, in all design aspects, to the extension stocks for the earlier models, except that they are slightly larger. They are two-screw, with concave non-medallion areas at the top. The 1905 catalog is the only catalog that mentions these special target stocks.
No pics of these in links above:
Returning back to the discussion of the Models 1902 and 1905, over the course of the next few years, the factory makes various engineering changes to these two models. None of these are mentioned in the catalogs, but the Collectors categorized them, as they occur, as the Model 1905 2nd Change, 3rd Change, and finally 4th Change. Of course, the factory is implementing these changes in both the Model 1902 and the Model 1905, but the Collectors have dropped the Model 1902 designation years ago.
Gradually, the catalog designation is changed, but up until about 1965, there is always two separate pictures in the catalogs; one of the square butt model, and one of the round butt model. In the 1915 D catalog, the reference is now to three (3) models: the Military & Police Round Butt, the Military & Police Square Butt, and the Military & Police Square Butt Target. The parts catalogs, however, continue to
note two different frames, designated as 1902 & 1905. The emergence of three models is very important, for several reasons:
First, the target model is only offered in 6" barrel, which means that any shorter-barrel target will have to be a special order.
Second, what was the 1905 will now only be available with fixed sights.
And third, the 1902 model will also only be available with fixed sights.
Most important, however, is the dawning recognition that, from the catalog perspective, the Model of 1905 has never been, and never will be, offered with a round butt. It is always offered as a square-butt only.
By 1925, the catalog now devotes 4 separate pages, complete with pictures, of four (4) offerings of these revolvers as follows:
1 Military & Police Round Butt Fixed Sights in .38
2 Military & Police Square Butt Fixed Sights in .38
3 Military & Police Square Butt Fixed Sights in 32-20
4 Military & Police Square Butt Target 6" only in 32-20 or .38
and, grooved triggers and grooved tangs show up. These distinctions may have been made between 1921 and 1925.
In the 1936 catalog, the 80th Anniversary catalog, there are separate pictures and pages for the K-frames, as follows:
1. Military & Police Round Butt in .38
2. Military & Police Model K Square Butt .38 & 32-20
3. S&W Target Revolvers 6" .38 M&P Target in .38 or 32-20
4. K-22 Target Revolver 6" only
The 1939 P-3 parts catalogs continue to describe the round-butt K-frame as "1902" . It’s clear that the catalogs have always kept the round butt vs. square butt distinction as two different models, even though they are virtually identical guns, except for certain options.
Following WW2, and the run-out of all the old parts, the K-frame was redesigned. The round-butt vs. square-butt separation was maintained well into the 1960's for the fixed-sighted revolvers. The target guns were even further delineated into several square-butt-only models.
What is important , for this story, is that the designation of Model 1902 survived, in one form or another, from its inception in 1902 until the beginning of World War 2 . During those years, it was always a round-butt-only gun, and about half way through its life, became known as the fixed-sighted Military & Police variant. Subsequently, the round-butt version of the fixed-sighted Military & Police became one of the
two Model 10 offerings : one in round butt, and one in square butt.
The gun that still survives to this day is the round-butt fixed-sighted Model 10, the modern-day version of the .38 Military 1902 . Its fixed-sighted companion, the .38 Military 1905 in square butt, is no longer offered. One hundred and five years is the longest continuously-offered revolver in the factories history, making it, indeed, the King!
Regards, Mike Priwer"
__________________
Jim
S&WCA #819
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