I sold my last 1873 for $950 but it was not as nice looking as yours BUT it was a very tight hardly used gun.
Also mine was set up to shoot Webley455 Caliber makeing it easyer to get ammo for it.
If yours is still the French 11 MM Caliber its much harder to load for,, but posible.
Check if a 45 ACP will chamber and head space on the case mouth. Alot were set up to shoot 45 ACP.
its a nice looking 1873.