A short-stemmed footed drinking glass with a generous bowl, and one of the standard English forms of the 19th century. It makes up roughly a fifth of the titles in the category. Listings describe them with pan tops, ovoid bowls, baluster stems and square lemon squeezer feet. Anglo-Irish and tavern rummers both turn up.

Are drinking glasses sold singly or in sets?

By the multiple, almost always. Two-thirds of titles say "glasses", a third specify a pair, and sets of six are common. Larger groups appear too: eight, twelve, sixteen, a nineteen-piece service, a suite of thirty-four, and one lot of eighty-four.

How old are most antique drinking glasses?

Victorian is the commonest label, followed by the 1930s, Georgian, the 1900s and the 1890s. Of the listings carrying a clean year, those years run from 1800 to 1940. A number of titles carry a circa date that the period field doesn't record, including c1740, c1750 and c1780, so the 18th century is better represented than the figures alone suggest.

Which colours turn up in coloured sets?

Cranberry recurs, along with Bristol green, emerald green, amber, amethyst, ruby red and vaseline. Colour is a defining strand of the category rather than an occasional novelty, and it appears on a substantial minority of the sets recorded.

Do Art Deco cocktail glasses come up?

Yes. The 1930s form the second largest period band on Sellingantiques, with martini, aperitif and cocktail glasses among them. Some arrive as full services with a decanter, and glasses on plated trays appear as well.

Is non-British glass common in this category?

No. The evidence is overwhelmingly English, and foreign glass shows up once or twice each. Murano and Salviati from Italy, Steinschonau and Bohemian work from central Europe, Biedermeier, Austrian and French Art Deco make up that small group.