Until recently I believed that the well known S&B headstamp on autopistol cartridges was SBP at the top and the caliber at the bottom were all post-WWII.
Working on another project I noticed that 1937 S&B catalog included a drawing of a 6.35mm Browning box, but the drawing on the box appeared to have a two position headstamp instead of the four position headstamp in the drawing of the same caliber in the catalog which was the " S&P / * / P / * / headstamp that had been used by S&B on most autopistol cartridges for at least a decade.
I realized that I had a S&B 7.65mm Browning box that was identical to the box illustrated in the 1937 catalog. except for the caliber. This box drawing clearly showed the headstamp as “SBP 7.65”. The cartridges in the box have shiny CNCS bullets, the same style that are on early “ak” headstamped 9mmP08 rounds (1941 dated cases and case lots 1 and 2 of 1942). They also had copper color primers.
I also found I had another 7.65mmB box with a totally different label which included “MADE IN CZECHOSLOVAKIA” indicating that it was produced shortly after WWII and marked for the US market.
The cartridges were a real surprise. Five were identical to those in the 1937 style box and the other 20 had GMCS bullets, the style bullet introduced on 9mmP, “ak” headstamped, near the end of 1941 (case lot 20 of 23 produced). They also have brass color primers.
My first guess would be that the first box was completed before the German occupation of the plant in 1939 and the “SBP. 7.65” headstamp was introduced in late 1936 or early 1937.
To better understand when the “SBP” headstamp was introduced, and the loads in these two boxes i am looking for some information.
Is there any evidence to even suggest that S&B produced 7.65mmB or any autopistol cartridges besides 9mmP after the German occupation of the Vlasim plant in early 1939 and before the end of the war? If :“Yes” please explain!
Is there any evidence suggesting the dates when the SBP headstamp was introduced on other Autopistol calibers and the boxes used for these cartridges before and after the war, if they differ from the two boxes styles illustrated above?
3 Is there any other information that may be relevant to this topic? If so please post it!
Any help is appreciated!