1905, 1911, 1911 A1 were all predecessors.
You will have to call Colt to find out.
@1972
Proofhouse.com has Colt sn data.
1977
100-1000 usd
Proofhouse.com has Colt sn data. If it's not there, call Colt and they will tell you.
your colt mark IV series 70 national match was made in 1972.
100-600 USD
1980-1983
@ 1978
Proofhouse.com has Colt sn data. If it's not there, call Colt and they will tell you.
100-1000 USD