Winchester Model 21 Grand American

[Kim I. Manning]

I am new to this forum, and have a question about Grand Americans. Even though it's a Parker forum, I figured some of the members might be able to point me in the right direction. Here is my question: Absent a Cody letter, is there any way to determine whether a purported "Grand American" was made by Winchester or is a copy? The Schwing book says that from 1960-1968, they would simply pick up a frame and use that for a G/A. He does not say whether the SN had already been stamped by that point. There appear to be three types of G/As floating around: real ones with a letter, CSMC guns, and "gray area" no letter types that could have been or were cobbled together by Galazan before he began producing his own.

I really appreciate any help I might get, and really enjoy the forum.

Thank you!