Vintage Ceramic Desktop Perpetual Calendar Architect Drafting Math Theme

Description

A vintage desktop perpetual calendar.  Ceramic with incised and painted months and days.  Designed like a bookshelf with 2 triangular scales and a notebook and pencil on top.  Architect theme?  Drafting?  Math Teacher?  3 3/8" x 1 7/8" x 3.25" high.  Weighs approx. 7 oz.
Condition: Pre-owned.  No chips or cracks.  Minor wear as seen in photos.
Provenance: Found at an Estate Sale.
Buy with Confidence: If you are not satisfied, you may return the item within 30 days (buyer pays postage) for a full refund.
Questions welcome!  Reasonable offers are encouraged!
Sales to the U.S. only please.