It says "Orrefors Pu 3090/12", and it is part of the "Selena" series. P means Palmqvist (obviously), u means that the piece has not been cut or engraved, 3090 it the number for the Selena series and the 12 is the model number for this particular model. The Selena series was initially designed around 1946-48, and in the catalogue from 1954 there are over 20 models )many of which were also available in different colours and sizes). I don't know how long they were in production, but probably well into the 60s (if not 70s) at least.