I think that the following are reasonable offers, assuming functionally excellent, all matching parts and a non-matching original period correct magazine:
1. A 1942 BYF that has been reblued $1000 (all matching)
Offer $700 Buy at $750 or less
2. A DWM 80% blue made in 1916 $1400 (all matching)
At this level it is not collectible, so shooter prices. $800 - $850
3. A DWM 85% in 1916 $1500 (all matching)
This is collectible, but lower grade so just above shooter prices: $850-$1000.
None of these are particularly rare. Condition could drive it below or slightly above my estimates.
Check out some of the more reasonable online dealers like Checkpoint Charlies... I don't have any interest in his business, and have not been a customer, but have heard positive things about him.
For example... here's a 42 BYF described as "dipped blue" - probably a refinish:
http://www.checkpointcharlies.com/sh...9&categoryid=9
Marc