I guess I was kind of shooting from the hip. On my 1920 Commercial and WW2 byf and the pictures I see in Kenyons book of the various models all the knurling on the magazine release is a square pattern and all the knurling on the take down lever and toggles is a diamond. If you look straight down on the knurling you'll see that the little points are square on the mag release and elongated on the other. I can try and send some pictures if this don't make sense.
On the chipped grips, it was a picture of the test 45 in Kenyons book that shows a common error.
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