Hi,
There are six different army acceptance marks on the G-dates. Here is the order that you will find them: B90/S91, B90/S92, W154/S92, 211/S92, 63/S92, and 63/63. Roughly, the B90/S91 and B90/S92 are found in the "a" block, the W154/S92 is found in the "a,b,c,& d" blocks, the 211/S92 and 63/S92 are found in the "d & e" blocks and the 63/63 in the "e & f" blocks. There is overlap between each transition.
It is interesting to see the S/42 on the frame next to the takedown knob on the right side. This is very unusual.
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