Here is a picture my Great Grand-dad's old Colt. Serial # is 18195. Barrel reads:
COLT's F.A. MFG.CO. HARTFORD CT. U.S.A.
PATENTED AUG. 5
TH 1884 NOVEMBER 6
TH 1888
COLT. D.A. 41
On the part that you pull back to release the cylinder the number 597. The serial number quoted is on the gun butt.
Caliber is .41LC and gun is in great condition. Bluing is mostly gone on the barrel because grand -kid, me, used to handle it a lot as a youngster. I re-load for it with very light loads. Gun is capable of reasonable accuracy out to 15 yards. Beyond that it becomes a bit hit and miss. LOL. I probably have shot it more in the last two years than it has been shot in the 100+ years it has been in the family
Sure would like to know what model this gun is. Gun will go to my oldest son per grand-dads request.
Stay Safe