10-1000 USD depending on specifics.
If that is a Colt Ace model .22, then it was made in the 1st year of production which was 1931.
You MUST call Colt.
Proofhouse.com has Colt sn data.
Need a detailed description of all markings, finish, box, papers, accessories, condition, etc..
Original Colt Ace 1931 to 1941, quite rare, about 10500 made. Values I've seen are from $2500 to $4000 in excellent condition with one magazine. They also made a Service model with a floating chamber to duplicate the recoil of a .45 ACP. They reintroduced the Service Ace in 1978
Around 1931
Parts gun. You have a conversion unit on top of a frame that is beyond the Ace and Service Ace sn's
1978
You will have to call Colt to find out when it was made. 50-1000 USD or so
Check your serial number again because I show that the colt service ace only goes up to sm10809.and the colt ace serial number goes up to 13803.
The Service Model Ace was made from 1935-1945 and the sn range stopped at SM13803. The Ace was made from 1931-47 and 1978-1982. Your Ace was made in 1980. Value range 600-900 USD.