I would pay $1,000 for one in excellent cond.
I would pay $1000 plus for a Model 70 in mint condition.
not much. the 1911 was made for the military. The 70 was a later commercial model of the 1911
If it is chamberd for it, yes.
100-700 USD or so
100-1000 depending on specifics
A few hundred to a few thousand depending on condition, configuration and originality of parts.
100-1500 USD
You will have to call Colt to find out.
According to proofhouse.com a Colt 1911 commercial & 1st model N.M. .45 with that serial number was made in 1975.
50-400 usd
An unmodified .45-70 will be chambered for. 45-70. If you're uncertain that it hasn't been modified somehow, take it to a gunsmith. Do not try firing a .45LC through it if it is a .45-70 - this is a very dangerous thing to do.
100-10000 USD