Hi,
You guys have it narrowed down pretty good!
The byf 41's started showing up in the "n" block, which was a transition from the 1940/42, start of the 41/42, and start of the byf 41's. So you can find all three variations in this block.
Letter blocks N, O, P, Q, R, S, T, U, V, W, X, Y, Z, and part of the No Suffix all have the 655/655 acceptance marks.
The No suffix block is the transition block and can have either 655/655 -- 655/135 -- or 135/135 acceptance marks.
The "A" block will have either 655/655 or 135/135 marks on them, and the "B" block will have only 135/135 marks.
Each transition took place fairly quickly, but it is possible to find a "straggler" a few thousand Lugers down the line, but for the most part this gives you a fairly good idea where the transitions took place.
So - N, O, P, Q, R, S, T, U, V, W, X, Y, Z, --- NS, A, B is the range and you can get an idea of the transition. Hope that helps. Bill
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