1/24/1965
Based on the records I have, a junior Colt .25 with the OD prefix serial number started in 1971.
about 1921
Proofhouse.com has Colt sn data.
You can find out at Proofhouse.com in the Colt tables.
You must call Colt to find out.
1918
1934 for the Colt 1903 hammerless .32.
You will have to call Colt to find out.
Go to: www. proofhouse.com with serial number.
You will have to call Colt
The date of manufacture is determined by the Colt model type and serial number. See: www.proofhouse.com/colt/index.html
Contact Colt Customer Service for a date of manufacture- no published data.
Around 1919 for the Colt 1903 hammerless .32