:lol: Tiger, maybe not worth hundreds, but I think green is a little unusual. I seem to remember Ivo has one in a kind of straw colour glass from memory. I've got a couple in the more usual blue.
Search under 'Royo' on the message boards, I think you'll find Ivo's posting and you can see my lidded comport thingy too.
There's a connection with Royo (so the saying goes) to Moser, but I think it's unconfirmed. I think Royo are made in Spain, and they're jolly expensive to buy there. Not sure if your green vase means it's an earlier production or something. :?