Someone has applied a coat or two of cold blue and turned the gun black. They also failed to remove all the original nickel finish first.

Are you certain about the serial number? That number puts the revolver well into the 3rd Model production, but the top latch is clearly from a 2nd Model. That serial number places ship date around 1891. Can you make out the numbers on the top latch or the barrel assembly?

Correction: Looking closely at the latch, it is a 2nd Model latch, not a 3rd. The push button latch of the 2nd and 3rd Models are similar, but the 3rd is smaller.

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Gary
SWCA 2515