Marsh, if it a repro, most are, and you want to shoot it a lot, or use it in CAS, it's better to replace the front sight with a taller one. I do.
FMB, the Sailing ships mark it as a Colt Navy or Army, on the 1851/60/61 frame. The dates were the dates of a sea battle with the Mexican Navy in 1843. As yours is a 44 with an octagonal barrel, it is an 1851 Navy but in 44 caliber instead of the proper 36. The "rack & pinion" would be more obvious to you, if your gun had it. Yours has the screw pivots in the loading lever parts, as it is an 1851 design. ASM made them in 44 with both full octagon and half round "Dragoon" style barrels. Is the receiver frame brass or steel? We expect the grip frames to be brass. If the main receiver is also brass, don't shoot it, or use light loads.
The value is somewhere around $150.