Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
made by Colt for US Navy. not unusual to see a springfield slide on a Colt frame
made about 1852
Colt data at Proofhouse.com
1862
The highest for Colt 1851 navy original was only 215348 in 1873. Yours must be a reproduction model?
The records I have show it was produced in 1863.
Go to proofhouse.com to look up date. There are more that one type of SA Navy Colts.
how much is a 1851 colt navy 36 gun
value always depends on overall condition. with a serial number the date and maker can be established.................
Colt 1851 Navy sn 179639 was made in 1864 (175000-179999)
The 1851 Colt navy with serial # 112343 was produced in 1861. (98000-117999) about 1861
check colt manufacturing for colt 1851 with full loading and shooting directionss i just reviewed this article and it is very clear a lot of info on 1851 navy colt, good luck.