believe after 1971
100-400 USD
mk is short for 'mark'
You will have to call Colt
You will have to call Colt to find out.
You must call Colt.
Go to Colt's website and request a manual.
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.