believe after 1971
100-400 USD
mk is short for 'mark'
You will have to call Colt
Go to Colt's website and request a manual.
You will have to call Colt to find out.
You must call Colt.
i would like to know what year that colt MK IV series 80 with serial # 302587 manufacture and what made is this?
Fourth variation.
Call Colt.
Proofhouse.com has Colt sn data
You will have to call Colt to find out.