Yep I'd say C Series Second Gen. Colt. NIB unfired,unturned Blue book of Modern Blackpowder Arms list it at 100% at $550.00,(100% is NIB unturned, unfired other words not touched and with all the paperwork from Colt.) and if the box is in immaculate shape that is worth a premium too.
I have a 4 digit 2nd Gen made in 1972. S/N started in the 4XXX range and went up. I'd say that it is a 1974 or 1975.
The Blue book of Modern Blackpowder Arms
COLT´S MANUFACTURING COMPANY, INC.
Current firearms manufacturer with headquarters located in West Hartford, CT.
Colt´s Manufacturing Company, Inc. is the previous manufacturer of 2nd Generation Colt percussion revolvers located in Hartford, CT. Colt used subcontractors to supply rough castings for the manufacture of these black powder pistols. Throughout the production years 1971-1982, these rough castings were produced in Italy and the reproductions were completed in the United States. Initially, Val Forgett and Navy Arms provided these parts/components during 1971-73. Lou Imperato supplied these parts from 1974-76. In both instances, these revolvers were assembled and finished in Colt´s facilities in Connecticut. Finally, from 1978-1982, Colt subcontracted both parts procurement and final production to Lou Imperato and Iver Johnson Arms in Middlesex, NJ. Colt percussion revolvers produced by Iver Johnson had frames, center pins, nipples, and screws manufactured in the United States. In all instances, these revolvers were manufactured in accordance with Colt´s strict specifications and quality control. Additionally, Colt´s performed final inspection for all models. All percussion models manufactured from 1971 through 1982, either by Colt or its subcontractor, are regarded as authentic Colt pistols and not Italian replicas.
The Colt Custom Shop also produced a limited number of special editions through the early 1990s from 2nd Generation production inventory. (Colt 2nd Generation models in the white are still known to exist.)
1851 Navy listed therein:
1851 NAVY "C" SERIES
- .36 cal. perc., 7.5 in. octagon barrel, hinged loading lever and six shot cylinder with roll engraved naval battle scene, "C" Series Royal Blue barrel and cylinder, color case hardened frame, loading lever, plunger, and hammer, silver plated brass backstrap and square back trigger guard, one-piece walnut stocks, 42 oz. This is the first series of second generation 1851 Navy revolvers produced. Serial number range 4201-25099. Mfg. 1971-78.
Grading 100% 98% 90% 80%
$550 $450 $350 $250
Last MSR was $200.
Note: The prices quoted above are for "C" Series 1851 Navy revolvers with wood grain cardboard box and styrofoam insert. "C" Series 1851 Navys with the early SAA style black flip top box in excellent condition command a $100.00 premium (serial number range 4201 to 5199). "C" Series 1851 Navys with the tan and brown flip top box in excellent condition command a $50.00 premium (serial number range 5200 to 12999).
Hope this helps