In the past 30 years only a handful of the rare reference 1873 have appeared at auction, in fact Antiquorum has only ever offered one other example. This particular example impresses by its overall condition considering its almost 100 years of existence with clear reference and serial numbers on the outer caseback and is fitted with its ultra prima chronometer movement. To further complement its desirability, it is fitted with an extremely rare original salmon so called "scientifical" dial due to its black round indexes, making this example probably the best ever seen.