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Fig. 1 Fig. 2 Fig. 3 Fig. 4 | [SIZE=+1]Zenith 18.28.1.P.E[/SIZE] Features stem wind and set sub second Data 18''', Dm= 39.55mm H= 5.2mm (5.4mm with winding wheels) 15 jewels f = 18000 A/h power reserve 36h Balance staff U230 Stem W1764 Hands 1.55 x 0.95 / 0.25mm Comments about the data | Remarks 1905-1982 (all types 18.28) open face calibre Breguet hairspring option: bimetallic screw balance (Fig.3) Example, year: signature; shock device 1-2) ca. 1930: 69145, Zenith - 145 3-4) ca. 1935: 85506, Zenith - 506 |