Hello,
Certainly, in some cases, stoppers were made by a seperate company and bought in by the maker of the vessel. Therefore the stoppers would be made as blanks, either to be cut, engraved or etched to match the base should it be decorated, and/or, for the peg to be ground into the base. This would be true even if the stopper were made in-house.
Logically then, a stopperer would be required to fit the stopper to the base, wherever it was made, and numbers would
likely be placed on each matching piece to ensure that they did not get mixed up.
That much we know, however, if the term 'tie numbers' was coined on the GMB, which I believe it was, (by Bernard, if memory serves well) then that should be acknowledged in the way it is referred to, in order that readers both now, and in the future, understand that this is the case. (For instance "They're becoming known as 'Tie numbers' would indicate recent usage.) This will then stop the need to track down the terms' origin
On a lighter note, I'm not sure that I'm looking forward to your next visit to a glass fair JP........
no clothes
:huh:

Nigel