I would not know what to make of the letters you report on the grips. Some colts had the New York address line-apparently a business location as the Hartford plant pre-existed introduction of the navy. The New York address was said to be reassuring to Colt customers from the Confederacy before the War as New York was regarded as more sympathetic to the southern cause than the rest of the north.
Without a serial number it is impossible to say much about your revolver. it might be helpful to know R.L Wilson attributes serial numbers 1- 90,000 to the 1850s, 93,000-180,000 to the civil war years; 185,000- 215,000+ from 1866-1873
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