Sue — See topic
Optic pressed ale glass = (Rummer) Thomas Gammon (Important).
It shouts Gammon's 12 October 1849 suite at me. See the seam at the top of the decorative lozenges just below the rim, separating the 3-sided mould from the plunger, particularly clear in your second photograph. Much later Davidson brought this technique of using the plunger to mould the rim to heights of perfection, and used it until the factory closed. Obviously the rim was moulded vertically and thins slightly towards the top, otherwise you wouldn't have been able to get the plunger off. It was then flared, probably with a conical former, although these early pieces could have been flared by hand, holding the foot in a gadget.
If there is a registration lozenge it will be sideways on at the base of the decorative lozenges by the stem, not on the inside.
Again I make the point that this suite demonstrates an unexpected level of sophistication in its manufacture, showing that British glass houses were substantially more advanced in 1849 than previously thought.
Nice find Sue.
Bernard C.