That Is a 6" 29-2' not a 5"er.

Your Colt Commander value would depend on the overall condition. You said it is from the 80s, which is not COLTs best work historically.

Still a nice COLT 1911 is easily worth $750, and Commanders are just cool guns no matter how you slice it. I see them priced locally from $750 to $999 based on condition.