I have a heavy clear glass vase, 5-sided, 6-1/4 inches tall, 4 inches wide at top, with an incuse frosted design of a nude male figure holding what appears to be a large double-tailed fish over his head. The bottom of the vase is marked Kosta B W 217. I have read some of the other responses, which only adds to the mystery. I wonder what the full name of the Kosta factory was - such as Kosta Boda Werke ? Or if the B refers to Elis Bergh? If the numerals are a reverse coded date, then this could be July, 1921. Thanks for any ideas!!