Approx. Ø52mm, approx. 89g, original silver case, serial number 139692, precision anchor work according to patent Louis Wille Pat-No. 68208, work number 315141, patented anchor barrier, so-called "double anchor", fine regulation, signed enamel dial(min. scratchleee), ringed steel hand, dial signed: Andreas Huber Urania watch factory "double anker watch", functional. Literature: Christoph Prignitz: "Double anchor, a pocket watch with rare technology". According to this, only 6 copies are known with this clock. The subject-matter of the patent was a shock protection of the oscillating system, as no other anchor barrier can be found. Another of these watches, the number 315150 we auctioned with a result of 3700€.