Actually, the black plastic grips appeared in June of 1941 and became standard issue in concert with the wood grips on 41-byf Lugers. What happened in the - u - block of the 41-byf production had to do with the numbering of Luger magazines. The records indicate that Mauser seriously curtailed the numbering of Luger magazines at this point. I suspect it was because the black plastic magazine bottoms were to difficult to number (They numbered a few) consequently, about 97% of the magazine numbering ceased. For what it's worth, I have recorded gobs of - u - block magazine numbers, None in the - v - block, two in the - w - block, four in the - x - block and two in the - y - block. The common magazine during this period was the C.G. Haenel magazine marked "fxo-SE37-P08" the P 08 was rightside up vs the earlier fxo magazines with the upside down P 08 mark. Just another opinion.
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