I do not have any books in front of me now but one of the most important details in dating these is if there is a hold open latch on the left side of the frame where the safety is located on a 1911. That seperates early war from late war models and is a good start. I do not know off hand what the cutoff date on this feature is.
These are neat funs and I wish I had the one I used to own.
Steve
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