Those estimates, unlike David's opinion that provenance won't make any difference, are more in the ballpark. That would mean that "provenance should make a 100% to 150% difference in value compared to a gun with no provenance. Working from base A-1 values, these two posters estimate that the Czar's gun will sell for two to three times the value of an A-1 without provenance. I agree, but will raise them another 100%. I would even accept a little surface rust.