You will have to call Colt to find out.
You need to call Colt. That sn is beyond the published lists.
50-500 USD. You must call Colt
You will need to call Colt to find out.
The .45 Colt Mark IV Series 70 with serial number 66853B70 was manufactured in 1977. The Series 70 Colt 1911 pistols were produced from 1970 to 1983, and this specific serial number indicates its production year within that range.
proofhouse.com
1980-1983
it is disassembled the same way as a military 45 pistol..................
The Colt Mark IV Series 80 in .45 Colt was introduced in 1983 as part of Colt's series of semi-automatic pistols. The Series 80 incorporated a firing pin safety mechanism, enhancing the safety of the firearm. Production continued throughout the 1980s and into the 1990s, with various models and configurations available during that time. Specific manufacturing dates can vary based on the model and production runs.
100-1000 depending on specifics
Published data doesn't cover your sn. You will have to call Colt.
You must call Colt. 50-500 USD
100-1500 USD