This is a 1950s Thales Pinwheel calculator in excellent operational and display condition.  The Thales calculator was a quality machine, established in 1911, they produced four models (i.e. A, B, C & D).  This is their model C or Cer that has nine places for settings and thirteen windows for results.  It is stamped with very early Serial No. 83625 (they started with 83439).  Backside dealer sticker sign is: H. Messingfeld - Büromaschinen-Mechanikermeister - Dortmund-Hörde, Tel. 42602.  Machine size is 12” length x 5.5” wide x 5” high and weighs 16 lbs.  This is a beautiful machine that will highlight any collection of early computing.