Actually, what we call "guild guns" are pretty much any doubles with no name on them. As noted above, quite commonly seen coming out of Belgium and Germany. There are also a whole lot of French no-namers. The suggested term of "trade gun" is certainly more accurate, because these are guns made "in the trade". That is to say, the combined efforts of a barrelmaker, actioner, stock maker, etc--all outworkers, none of them working under the same roof--to produce a decent finished product. The Birmingham trade functioned pretty much the same way, the main difference being that someone's name got slapped on the Brummie trade gun before it was sold. Perhaps the owner of the shop which may have commissioned it, or finished it, or perhaps just sold it.