Gun show crack

Don't know, Where would I find the series number? like I said first timer with a 1911. All I can see is the patented dates on one side. and M1911A1 US Army and property of United States.

Hard to see in your pic,looked like it had the horse on the side.

Been 17 years since I owned a Colt.(Series 70 Commander in nickel.

EDIT: Sorry Jaws,didn't mean to hijack,was hoping to hear more about your Colt.