Seth Thomas No 10. Office Calendar. Seth Thomas No 10. Double Dial Office Calendar Clock. 10 in. dial has been repainted and has black roman hour numerals, and blued spade hands; 8 day, brass, weight driven movement, has deadbeat escapement, retaining power and silvered pendulum, bob with wood stick and steel weight. Lower 31 day calendar dial has exposed month and days of the week, has original brass cylinders and paper labels, calendar mechanism is in good running condition. In a walnut case (refinished) having an arched crest with centered rosette, turned columns, finials and teardrop finials, has paper label inside case; replaced dials. 49 in. high