I've seen three sizes, GH 209, 210, 211 / 214 (not convinced that this isn't meant to be 211, signatures are often a bit rough and I've never seen a 212 or 213), yours is the largest.
As kisslikeether says, they come in two colour variations; often signed lila (purple) and smaragd (emerald), although I reckon it's much more blue that green.
Re date, I think these were pretty early; mid 1950s ?
Value depends on condition - Afors glass fogs really easy with water - can be professionally cleaned but will knock a lot off if bad. With no damage I'd suggest £80 - £120 ish.
Are you in Australia ? shipping will be a killer to Europe/USA, but you do see quite a bit of his stuff in Australia, so you might be lucky with a local buyer.
(and I've got 2 already)
Cheers
Gareth