I first saw this gun 2 years ago when Bill Moore had it, and asking was $110,000 USD. It made its rounds at SCI during that time and no takers. Then Caswell took it in on all trade, that's why the gun can be had for all trade.

I am surprised that given the chain of events surrounding the gun that Champlin's decided to up the asking over what was already $30k to much when it was at $110k.

The rising bite from Mike looks nice but probably pre-dates 1900 as 500nitro pointed out, if that's the case it would most likely be a bored out 450 rather than a re-barrel as suggested above.