Congrats, that's a beauty and pretty good deal.
You have a British Svc revolver 455 Hand Ejector - 2nd Model. It's undoubtedly from a group shipped to Shapleigh Hardware Dec 1917 and never left the states., hence no English import/proof/export stamps.
It appears to be all original and not converted from its original cartridge, 455 Mark II service cartridge; interchangeable with the 455 Eley.
See full detail below for your version #3:
THERE ARE THREE BASIC VERSIONS OF .455 chambered Hand Ejector revolvers made by S&W under contract to the British for WW I. All three groups include some triple locks, but those in the 3rd group (3.B.) are actually the same as those in the 1st group. “When” roll marked with the cal., they are roll marked only SMITH & WESSON 455 because all versions are actually reamed to also chamber the longer MK I cartridge per the British contract. Therefore the ‘book name’ references of 455 Mark II for all versions of S&W 455 chambered revolvers is a bit of a misnomer. S&W historical letters usually list the cartridge as the 455 Colt (the American equivalent cartridge, but the length of the 455 Mk I), and occasionally, 455 Eley.
This is not TO be confused with the British name for the revolver “MK II” for the 455 Mark II HE – 2nd Model, which the British stamped MK II on the left rear frame of the revolvers and are known as such by them.
The WWI British contract Colt is marked ".455 ELEY", different than The S&W 455 marking.
They are:
1. “.44 HE - 1st Model”, ‘Triple Lock’, chambered for .455”: 812* factory reconfigured unassembled or unsold ".44 Spl HE 1st Models", often not stamped .455, numbered in the 44 Spl serial range. The original chamberings are unknown but most or all were likely originally .44 Spl. For the British military there are 666 #s 1104 thru 10417 (obviously not all serial #s in this range were used for the 666), the majority of which shipped by Oct 21, 1914. The extra 146 in serial range #s 9858-10007 (not all inclusive) went to the commercial market; 123 to England Oct 1,1914, and 23 in the US Jan 1, 1918 [N&J pgs. 203-205]. These 812 .455 TLs were serial #’d in the .44 1st Model serial # range of 1 to 10007. Per Neal & Jinks. Pg. 214, these are known to have been stamped SMITH & WESSON but not including the 455 cal. stamp.
* SCSW reports "over 800", but by shipped serial # count, it’s actually 812, 146 of which are commercial guns [S&W N&J pgs. 203 - 205].
The 666 were shipped in 33 different groups ranging from 4/8/14 to 4/28/16 with the majority delivered 10/21/14. These will often have added lanyard swivels when converted to 455 at the factory by drilling thru the serial # which is factory re-stamped on the left side of the grip frame under the stock.
The 146 .44 HE 1st Models that were converted/built as .455s assembled some time after the first 666 military .44 1st Model .455 TLs and sold commercially; 123 were sold to the British, shipped to Wilkinson Sword 10/1/14 and 23 sold in the US, shipped to Shapleigh Hardware in St. Louis, MO. on 1/1/1918.
The 23 at some point were converted to .45 Colt and it’s unknown if by the factory before shipment to Shapleigh or after delivery to Shapleigh. However even IF converted by the factory (as suggested in a September 2013 Rock Island gun auction narrative), the revolvers would not have a star on the butt or a rework date on the grip frame because they did not go back to the factory for conversion as rework, they were converted before they left the factory.
2. “.455 Mark II HE - 1st Model TL” in the new .455 British serial # range 1 to #5461 [H of S&W pg. 201] completed Jan. 19, 1915. Thus creating 63* duplicate serial #s with the 666 1st version “.44 HE 1st Model TL” chambered in .455 in #1., numbered in the 44 serial number range.
*There are 63 duplicate TL #s existing of the 666 contract listed numbers of .44 HE TLs chambered in .455 (1st version), #s 1104-3320 in the .44 HE #range - not all inclusive, known and listed, with 63 of the .455 HE 1st Model TLs (2nd version) #s 1–5461 in the Brit contract # range.
There’s also duplicate #s of the .44 HE 1st Model TL .455s (the early 666 and the late 691)#5462 to #15376 (the last .44 HE 1st Model TL serial # known), of ~796 with .455 HE 2nd Models (3rd version below) #s 5462 up thru #10007, and #12,000 thru the #14,000s in the Brit range, but the exact #s of duplicates is unknown because not all #s are known to have been used in either range.
3.A. “.455 Mark II HE - 2nd Model” (sans extractor barrel shroud and 3rd lock), but with slightly larger cylinder/frame window dimensions from versions:
1. the ".44 HE 1st Model Triple Lock" factory converted to .455, and
2. the ".455 HE 1st Model TL" produced in .455.
The 2nd Model continued in the .455 1st Model TL Brit serial range beginning #5462 to #74755, shipped 1915-17.
By Feb 1916 724* were manufactured for the Canadians, chambered in 45 Colt, presumed for the RCMP [H of S&W, pg. 203].
Another 15** in 45 Colt were sold commercially in 1916.
The Canadian military also bought 14,500*** .455 2nd Models [H of S&W, pg. 203].
And 1105 2nd Models were released for commercial sales in the US, shipped Dec 1917 to Shapleigh Hardware in St. Louis [S&W, N&J pg. 216].
*””Roy's comments on that model might be helpful here [regarding an original Factory .45 Colt # 747xx that shipped on May 4, 1917]: "Between April and June 1917 Smith & Wesson manufactured 700 units of 2nd Models that are listed in the manufacturing records as .45 Colt caliber. Unfortunately the manufacturing records did not record serial numbers. The shipping records for this model list, in this same time period, the sale of 703 units, but the shipping records do not list the caliber. I am positive that the sale of these 703 units are the .45 Colt listed in the manufacturing records. The extra 3 units could have been manufactured from revolvers that had already been assembled. ”Roy Jinks” Bob (Bettis1)
“The 727 [724]number could be correct but there have only been a small number that are from this shipment, less than 20 documented.” Jim Fisher ‘bmg60’
http://smith-wessonforum.com/s-w-ha...d-model-hand-ejector-45-lc.html#post139085603
**“The run of 15 with consecutive serial numbers, made in 1916 are all commercial, #46748 from that range is documented. There is no cal markings on this gun and the only other markings are the standard. Roy had to research the build records to find them because the shipping records didn’t list the Cal. The front sights on these factory chambered for.45 Colt is a little higher [than 455 revolvers]. This is the only one of the 15 that is known. Roy said he guessed the other 14 were for a shipment to some other country.” Jim Fisher ‘bmg60’
http://smith-wessonforum.com/s-w-ha...d-model-hand-ejector-45-lc.html#post139086401
***Canadian military shipments of 14,500:
-1500 Shipped after Aug. 1915
-850 Shipped thru December 24th, 1915
-150 Shipped thru March 31st, 1916
-6,000 Shipped thru July 22nd, 1916
-6000 Shipped February 10, 1917
At least 1 shipped July 29th, 1916, see post #10:
http://smith-wessonforum.com/s-w-ha...5-455-hand-ejector-45-colt.html#post139027072
3.B. “.44 HE - 1st Model”, ‘Triple Lock’, chambered for .455”: “As the Brit contracts were finishing up in [April, H of S&W pg. 203] 1916, S&W found enough [44 HE frames and 455] parts to build 691 .44 HE 1st Model [per Roy Jinks in various letters], Triple Lock frames [like #1. above chambered in .455]. These guns are also numbered in the .44 Spl serial number series. I have no idea why they were not just numbered in the .455 series. Perhaps it was .455 barrels and cylinders that the factory found, and they simply turned again to existing 44 HE 1st Model TL frames to use them up. They were sold commercially.” Lee Jarrett