The only glass I need are GLASSES / EYE GLASSES/ SPECTACLES!!! (you don't seem to cater for these)
One of the photos I took was a birdseye. When I photoshopped it to get rid of reflections which made it look like milk glass, I found the mark.
It reads: Orrefors cp 4303-531 or 501.
It is 170 x 60 mm.
Thanks Anne, but I don't want to drive you totally nuts. Will wait for weekend.