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PhD in Over-Engineering
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Not enough of an expert to give you dates, but here's a start. The first one is the standard A4 style that is most common in my experience. Some time in the 30s is when this came into being, along with the adoption of the A4.

The middle one is 50s vintage and is specific to the M37 tank gun. It is rare and I am in need of one, hint hint!

The one piece on the right came late in WWII I believe. I know that Saginaw produced that style as I have seen them so marked, but never saw pics from WWII with that style mounted. I assume they must have been made during the war as Saginaw production ceased along with the other mfgs at the war's end. While RIA produced A6s and M37s in the 50s, no more A4s were made after WWII, as far as I am aware.

Of course, this is only to the best of my knowledge. I don't know everything, despite the appearance I create around here that I THINK I do! ;)

Any other input, backing me up or gainsaying me is welcome!
 

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PhD in Over-Engineering
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12,241 Posts
blkbd- I knew you weren't going to let go of that booster. Just threw that in, he he!

It is unusual to find that on a 1919 kit. The early manuals I have seen that cover the M37 have the standard two-piece, like yours on the left. The
1969 ones show the right one as you mentioned. I have a Marine Corp M37 parts manual that shows the middle one. I guess all three can be considered correct! But real M37 kits are so rare, and surplus boosters of that style I have yet to see on the market. I'll turn one up someday. :)

Your friend is right. The only time you want to break up any parts in a USGI kit is if you have different mfg markings and wish to match everything up. Most don't care about that. For those components that were modified by Israel, the unmodified USGI ones are more valuable at this time.

Wish I had precise dates on the design changes, but at least that is a reasonable history.
 
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