It is a Baker Gun & Forging Co. first year production (1892) 2 pin lockplate A grade with the early etched 'engraving'

[Linked Image from photos.smugmug.com]

Remarkably in the 130 years of use, the screws have not been buggered, esp. small firing pin retaining screw.

The crack at the apex of the left lockplate must be repaired

[Linked Image from photos.smugmug.com]

The gunsmith doing the repair should establish the integrity of the damascus barrels with a bore scope and wall thickness gauge.

There is lots of information on Daryl Hallquist's Baker Collectors site
https://docs.google.com/document/d/1PqK3UImDCrsOrk6O_2DsovHXvaNSzliSiwaP35Y6PMk/edit

and similar early etched patterns are shown here; including a B grade SN 26 and a Paragon SN 260
https://docs.google.com/document/d/1uGeSuMJBPMNGh0ydCQXeAnpGRLANfl0Uhe954818veQ/edit

https://sites.google.com/a/damascusknowledge.com/www/home