1911 grip diamond ??

[lastditch]

Hello to all,
Been prowling around Milsurps site for a while for information, I'm mainly a blade collector. Most question on firearms I have had can be found with a simple search.
I now have a question that I haven't found a definitive answer for yet.

I'm in the process of trying to purchase a Colt 1911 in the 474000 serial number range.
After inspecting the piece I found the grip have 13 lines instead of the standard 15 + or - .
Also in photos some of the diamond checkering does not form a complete diamond in the first row around large diamond..
I have heard that incomplete diamond's can be repo grips.
I did find some reference to 13 line grip used for late production of the Colt 1911.
SO...did the Colt 1911 use 13 line grip in later production and if yes anyone know what range.
From photo's can anyone tell if grip are OK ?

Thank you in advance for any assistance.

Tom “lastditch”

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