:clap:
Unlikely to be found in any book - but it looks perfectly right to me for a Boffo jug from the early period.
The carafe-y bit is the right shape, the seediness of the amethyst is right, the silver salt bits look right, the round, polished pontil mark is right for Boffo, and the short neck with bell-shaped base is right for early Mdina.
I've got a couple of handle-less cocktail jugs which are "squished" at the top to make the lump-trap and pouring bit.
The most "common" jugs are little ones, with textured sides, (not really that common at all) but I do have a big bottle with a square sort of handle. They don't turn up too often.