What to look for when choosing
Start with the relief, because it sets the look more than the shape does. Vertical ribs make a glass look slimmer and belong to the art deco line. Pressed flower and bee motifs are rounder and more rustic and come from the French tradition. A smooth wall with only a heavy foot reads as nineteen-fifties. Choose one language and keep to it across the table, because two kinds of relief side by side look messy rather than collected.
Then the size, and that is where the surprise lies. A vintage wine glass is smaller than a modern one: around 32 to 33 cl, where a present-day red wine glass quickly reaches 45 cl. That is not a shortcoming but the starting point of the period, because a 12 cl measure still sits comfortably in such a bowl. For water and soft drinks you end up with the tumblers of 34 to 35 cl, for an aperitif with the liqueur glasses of around 11 cl, and for sparkling wine you choose between a 17 cl flute and a 16 cl coupe. With coloured glass, you are best off sticking to one shade alongside clear.