According to proofhouse.com a Colt 1911 commercial & 1st model N.M. .45 with that serial number was made in 1975.
1980-1983
@ 1978
You will need to call Colt
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the original colt gold cup 70 series is worth about 1,000 dollars roughly
You will have to call Colt to find out.
Colt data at Proofhouse.com
@1972
The Colt MK4 Series 70 models were manufactured from 1970 until 1983. I'm sorry, but I couldn't find any information on that specific gun.Colt Firearms provides this service. See the link below for information.
Proofhouse.com has Colt sn data.
Proofhouse.com has Colt sn data. If it's not there, call Colt and they will tell you.
100-1500 uSD