I think that Bentley and Playfair made mostly guns for the trade. A look at the 1911 catalog will show their advertising to other gunsmiths, with good illustrations of details you probably have seen on many guns with the names of others on them. They offered guns in various states of finish. I have one currently for sale marked Charles Playfair, Aberdeen. I have seen or owned Bentley and Playfair manufactured guns by Braddell of Belfast, Monk, and many others. Again , the details in the catalog of 1911 will show up on guns of many provincial makers that one may have seen.