Harbridge material is rather thin on the ground at the best of times - these are a good find and marvelous that there is at least on with a label, otherwise we'd be lost for an attribution. In Nigel's booklet he has simply added the comment.......... "Items were marked with an acid stamp to the base". Harbridge were certainly very keen on this sort of cut decoration on the rims of their vases, but then so too were Stuart and Thomas Webb, but in the main it looks like Harbridge carried on with this feature long after the other two houses had dropped what was obviously a fashion thing. With Stuart and T/Webb their heyday for notching the rims of vases etc. was during the first quarter of the C20.
Cut decoration right on the rim of drinking glasses - as opposed to machine acid etching or wheel engraving - looks to have been almost non-existent prior to c. 1900, and it never seems to have been that common even in the C20. Possibly something to do with being unpleasant for the tongue during the act of drinking.
Clear glass can be difficult to photograph, but having taken lessons from Dirk my pix have now improved vastly

Bit late for me now - tiring day with the grandchildren - so will send you a PM tomorrow re your other question.
