Hi Ed,
The 1940/42 can have either blank 655 stamped grips or 655 and the serial number.
The correct magazine for an "h" block gun would be a code 122 -- the early examples had either a 122 or a 655 proofed bottom.
The inside sideplate number is one digit higher on these. The K dates, G-dates, and 1936 did not do this and the 1937 almost always had the same first two digits of the serial. Then late 1937 they started going on digit higher. I do not know why and have never heard an explanation.
The 1940/42 started in the Z blocks so your gun is right in the middle of the production as they went into the N block.
There are the common military models, the navy models, and there are a very few police models with a sear safety. The only different variations in the military models is the type of magazines they used -- early had 655, 122 with and E/37 on the base (rare magazines), and the most common 122 magazines.
Hope this helps you some -- Bill Munis
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