I saw this same gun and letter a couple of decades ago. It is a fun exercise to read the letter and look at the gun. Although Baker did offer the Black Beauty Special before the sale to Folsom, I have never seen a Black Beauty Special that was not a Folsom gun. I have cataloged maybe 3000 Bakers, and one has not shown up. This gun still has the Folsom F on the forend iron. Other places the F has been removed. The serial number is from the Folsom Series and the small details are all Folsom details. [under lug, firing pin retaining screws, trigger guard, rib markings etc.] You can look at some real Bakers on my website.

http://www.bakercollectors.com/