Tamid, I have been interested in Baker guns for a while. That etching started in their A and B line in about 1892 and ended just before the turn of the century when engraver Frank Mason came on board. Some of the earliest etched patterns were quite elaborate, almost like an L C Smith Crown Grade. I have never found any original notes or descriptions of the etching process. I think some hard to get to areas of the receivers were hand engraved.

http://www.bakercollectors.com/