Unusual Art Deco period glass plate, with an intaglio design of what I believe is Sagittarius, with lovely sand blasted shading/features.
Sadly, this piece is not signed or marked. I've had this for over 10 years, hoping to finding out who made it, but have been unsuccessful, and it's time to move it on.

Polished out pontil on the base.

Diameter is approx 31cm. 

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Please be aware...
when you are buying vintage glassware, you should expect some age related signs of wear such as very small fine surface scratches/marks. Also many of the items are hand made, they may have small imperfections such as bubbles, inclusions & lumps within the glass and often tool marks from where they have been shaped and worked in the manufacturing process. These are not usually seen by collectors as faults or damage, but as part of the character of hand made glass and are not usually mentioned in the description.