It is true that Colt engraved the cylinders from the 1836 Paterson all the way through the 1862 Pocket Police/Pocket Navy. It was basically his "signature" that it was a Colt gun. Even the somewhat look-a-like revolvers of the period (Manhattan, Metropolitan, et al) had plain or different cylinder rollmarks.
To my knowledge, the only Colt cylinders that were not rollmarked were the 1860 Army full-fluted cylinders. None of the Confederate "copies" of the Colt 1851 Navy had rollmarked cylinders (Schneider & Glassick, Leech & Rigdon, Rigdon & Ansley, Augusta Machine Works, Columbus Fire Arms Manufacturing Company, Griswold & Gunnison, J.H. Dance & Brothers, and L.E. Tucker & Sons). It was cheaper for the Confederate gunmakers to eliminate that aspect, and it was also cheaper to produce a part round/part octagonal barrel as opposed to a full octagonal barrel as found on the Colt 1851 Navy.
My replica 1862 Dance .36 and Rigdon & Ansley .36. No apologies for the Confederate Battle flag as it represents that era of the ACW.
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Regards,
Jim