David,
Thanks for the link. I was familiar with that website but hadn't run across the Giraffe. The signature on the bottom is very similar to mine. Looking around, I found they have another which is the same size as mine:http://www.modernistglass.com/glasspieces/view/2787. With respect to washing, I already gave it a good cleaning to remove some adhesive from a price sticker without any apparent harm.
Best regards,
Glass Nisse