Which model do you have? The Paterson, 1851 Navy, 1861 Navy, 1862 Police and 1861 Pocket Navy are all 36 caliber. There is also the Griswold and Gunnison and Augusta Confederate in 36 caliber.
The Uberti copy of the Colt 1851 Navy is a 6 shot percussion revolver with a 7.5" barrel.The cylinder has a Texas Navy-Mexico battle scene engraved on it. The frame, loading lever and hammer are case colored. The barrel and cylinder are blued with a steel or brass grip frame and trigger guard. It is available with a round or square trigger guard. The values for your gun are:
Add $10 for a round barrel
Add $20 for the London Model with a steel backstrap and trigger guard or if cut for a shoulder stock.
Add $250 for a detachable shoulder stock
Add 10% for a silver plated trigger guard and backstrap.
Add 20% for retail values.
I hope this helps you,