Without any hint from a well known builder, these tend to trade in the $350-$450 range and yours shows a lot of wear. If you have evidence of a Bill Davis, Ron Power, Austin Behlert, Travis Strahan, you can double that or nearly so.

In my opinion...
These are steals in the current market because they shoot like a house afire and typically have ridiculous double-action trigger feel, better than you'll find in any Python.

However...
You need to be a handloader to enjoy one, because they are almost always typically spec'd for use with Federal small pistol primers, and using ammo with most any other primer tends to give FTF on 1 or 2 rounds from every cylinder.