A King Cockeyed Hammer is the original S&W hammer--refashioned by grinding the spur off, and welding on a (King) replacement ($5.00). This was normally accomplished by sending your hammer to King. A King Short Action conversion is easily detected by cocking the hammer, and observing its position in relation to another (stock) gun---or simply by sight, given a modicum of familiarity with the long action pre-war guns. As to S&W "cockeyed" hammers, this from an April 13, 1998 "factory letter": "Smith & Wesson did ship a few handguns with this style of hammer at an extra charge of $1.00."
For those interested in such things, this from King's catalog (circa late 1930's): "The King System of Short Actions is now available for both Smith & Wesson and Colt Revolvers. "Short actions including adjusting trigger pull-----------S&W, $10.00---Colt, $8.50"
By the by, that $5.00 charge for the Cockeyed Hammer conversion anticipates King receiving only the hammer to be converted. You pay more if they had to disassemble/reassemble your gun. You could also buy a Cockeyed Hammer for $5.00-----plus the cost of the hammer.
Then, as now, there ain't no free lunch!!
Ralph Tremaine
And as an aside, and while any and all are entitled to their own opinions, the post-war S&W sight (which actually came to be in 1940) is anything but a "very superior" sight; although it is more simple to use.
That which preceded it, the so-called "two screw" sight is clearly the superior sight, simply by virtue of the fact it is infinitely adjustable whereas the so-called Micrometer ("click") sight is not----giving a change in point of impact of 1/4-1/2" (whatever it is) at 25 yards for each "click". Now that's good enough for most folks who couldn't drive nails, light matches, blow out candles, or murder Bumblebees in the first place; but the folks who are worthy of the name "Shooter" have no use for them whatsoever!
And by the by again, S&W handguns (for an unknown period of time) were decidedly different---one from the other (target vs. fixed sight) as respects trigger pull and action treatment. The trigger pull spec for Targets was 3-4 lbs.---5-7 lbs. for fixed sight. (As an aside, I checked the trigger pull on 14 M&P Targets from my collection of target guns---3.5 lbs. right down the line. (Yeah, I know there's no compelling reason to have 14 examples of the same gun, but then again, there's no compelling reason not to---and the M&P Target was THE preferred revolver, right down the line-----most especially among the "Long Shooters".) This from the 1925 S&W catalog: "For these reasons a special type of trigger pull is desirable-----not by any means simply a very light pull, but one having the peculiar quality termed "short and crisp" by shooters. This not only requires a special type of notch and trigger point, but requires a different adjustment of the working parts of the action."