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That's a decimal time watch made by Rainer Nienaber of Bünde, Germany, who produces unusual hand-made watches and clocks. As with French decimal clocks, hours are marked 1 to 10 on the inner circle, minutes up to 100 on the outer circle. Nienaber's web page says "1 day = 10 hours" but this picture taken at a show earlier this year in Basel says "1 tag = 2 x 10 Stunden". If you're looking for a decimal watch that's not made by Swatch, this is it, although it will probably set you back a few thousand more!