A rare double signed Favre-Leuba Kellmer Sea Sky Chronograph ref. 33043 (Kellmer likely being the long standing PA jeweler) appearing to be in NOS condition. It is housed in a substantial stainless steel case measuring approximately 43 mm, with a rounded rectangular profile. The watch is fitted with a blue bakelite rotating countdown bezel, intended for timing functions. The dial is grey with a three-register chronograph layout, silver sub-dials, and large luminous hands for legibility and the lume has aged beautifully over time. It is powered by a Valjoux 72 manual-wind chronograph movement, the widely used and respected caliber of the era. The watch is on new silicone straps (2).