Considering the time frame shown by fb, one would't expect to see many examples. However, the name could have been "recycled" at some later date. Only in the case of Boss(maybe), does the maker's name assure a given original quality grade. Mr. Williamson most likely made some of several grades. Very unlikely that he got many commissions to make best grade guns - but he might well have gotten a few. It is tempting to imagine that each maker always worked to his absolute best on every gun such that we can associate some maker with a skill level and therefore know what quality guns with his name posses. Didn't happen. Most/all maker's could get out a best gun by doing what best work their shops were capable of and contracting with specilaist outworkers who could do what they couldn't inhouse.
Several "gunmaker" shops, Evans comes to mind, did very well without making guns, rather by buying in most everything, but making very sure the customer got his money's worth. Many people went to Mr. Evans not because they hoped for a bargain, but because they knew they would get fair dealing whether they knew guns or not. Still do.
