Topic: Amber ribbed optic drinking glasses

[Jeffingtons]

Picked up a set of 5 of these delightful little things a few weeks ago for a couple of quid. Wondering if it's possible to attribute a maker or at least an approximate date to them.  Stylistically, I'd put them into early 20th century but it's purely guesswork. I scouring through google images has shown me nothing comparable so any ideas for further investigation much appreciated.

ps they are amber.  That is a white background they're photographed against but my camera just doesn't want to play ball right now.

[Lustrousstone]

You need to manually adjust the white balance on your camera or change the auto setting to incandescent light.