Hi all,i've acquired these to glasses recently and with a little research i think their flip glasses,a type of cocktail that was drunk over the pond, i think,they are about 13 ht and 8 wd broken pontils with a slight ring,they have a charming folk art quality about them and the ship engraving is very effective and in keeping with the whole feel of them, anyone know much about this type of glass and what age they maybe,they've got a 18th century feel about them but the wear to bases say more recent.