Hi all !
I am totally newbie here. This forum seemed to be a right place for my mystery 1911. This 1911 is in its original condition and guaranteed last time fired 1945. Since then nothing has been done to it. Not even cleaned. It seems to work nicely but I would like to clean it. Do I dare ?

I already did some research from the internet and found out some infos.
It seems to be Russianicon Contract Colt 1911 mfg 1916.
Could someone help me out with these markings ?
I would really appreciate especially if some knows what these U & S means and the number 6 or 9 below the bullet chamber ?

I already sent the inquiry to Colt, but..... 90 days response time ?!?
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