Bannerman's has been a favorite study for me for over half a century, and I have had the good fortune to have known many people and friends who had done business with Bannerman's both on "The Island" and in NYC. In addition to that I have collected Bannerman's catalogs for many years. None of the catalogs, nor any of the conversations with the old friends, ever touched upon Bannerman fraudulently marking items with "CSA". The link to the article about Bannerman only guesses that Bannerman had added the "CSA" marking to the revolver shown in the article. Bannerman made some interesting arms, but they were never done with the intent to defraud, as they were all purpose made for a number of reasons other than fraud.
J.