Anybody know how to get an approximate manufacture date on a Colt Mk. IV Series 80 1911 without having to pay Colt $100? SN is SS1211x (names changed to protect the innocent, yadda yadda) Thanks in advance! Edit: I know it was likely somewhere between 1983 and 1988 because it's a Series 80 and still had the collet bushing. Just curious if I can get a more accurate (maybe to the year) without asking Colt.