First of all, the slide is blue and appears
un-refinished.
On the left side is the following:
PATENTED APR 20, 1897. SEPT9, 1902
DEC 19, 1905. FEB 14, 1911. AUG 19, ---3
(Colt Horse Emblem)
COLT'S PT. F. A MFG CO
HARTFORD,CT. USA
On the right side of the slide, 1/2" in front of the ejection port, is the
following:
COLT AUTOMATIC
CALIBRE 45
Needless to say it's a full-size 1911, with a 7-3/8" long slide. There are 19 vertical cocking serrations below the rear sight, starting just forward of the safety notch (on the left side), continuing forward for a distance of about 1-1/4."
I do not know if it was GI issue.
Thanks.