Hi David, WELCOME to the Luger Forum. The 41 byf Lugers started in the "O" suffix, so either "f" or "i" would be incorrect. A "t" suffix would be most likely!! A picture would do wonders.
The early 41 byf Lugers had magazines marked with a "122" and were matched numbered to the postol. Then came the "fxo" magazines numbered to the pistol until (about) the "v" suffix. Then a combination of blank bottom "fxo" magazines were supplied either with aluminum or black plastic materials. I suspect they used up the aluminum bottoms, then switched to the plastic as the aluminum bottom supply was exhausted. There is no way to defend that theory since the records were destroyed. Hope this helps!!
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