I was looking at a gun I found online earlier today. Based upon the caliber, the maker, and the condition as you perceive it to be, is it overpriced or underpriced?

This gun is a Cogswell & Harrison in a .475 Straight with a sidelock action. Here's the description from the seller:

Fully scroll engraved action that has possibly been re-colored. Features Cogswell's unique two piece plate sidelock action. Two triggers and a bolted safe. An excellent choice for anybody considering taking on the world's most dangerous game. An excellent caliber and reliable package from one of the most well known English makers.

Stock number 24925
Calibre .475 Straight
Action Sidelock
Barrel length 25"
Rib Quarter
Triggers Two
Safe Bolted
Ejectors No
Sights 1 + 2
Telescope No
Stock Pistol Grip
Stock length 14 1/2"
Weight 11 lbs 4 oz
Case No

Price is $22,500. I'm not loooking to buy it, but just for discussion's sake, how is this gun priced in your opinion?