You will have to call Colt
Colt's customer service says 1996.
It tells the year of manufacture of a Colt.
Proofhouse.com has Colt serial number tables.
i would like to know what year that colt MK IV series 80 with serial # 302587 manufacture and what made is this?
No serial number provided.
Your colt was made in 1956.
made by Colt in 1913
it was made by Colt in 1917
Call Colt with the sn and they will tell you.
Can't be answered without the serial number.
Proofhouse.com has Colt serial numbers you can look up
Proofhouse.com has Colt sn data.