Ebauches SA, 475A P2-V1 Prototype, 1959
Category: aesthetic prototype
Description: Asymmetric nickel plated brass cased prototype with polished surfaces (EPSA, E. Piquerez SA). Stainless steel snap case back with no engraving. White dial with silver coloured raised, 15min baton indexes, black line decorations. ‘ELECTRIC’ in black underneath 12, ‘475 A’ in blue above ‘6’. Silver coloured hands and original acrylic crystal. Nickel plated, base metal crowns, the left crown decorated with a lightning bolt in relief.
Dimensions: 36mm (without crowns), lug – lug: 42.5mm, lug width: 18mm
Movement: L475 Prototype movement, unmarked, unnumbered
Additional info: The left crown with the lightning bolt decoration hides a contact to attach the device to recharge the big Leclanché’ rechargeable battery underneath the back cover.
There is also an even rarer version of this case which houses a conventional battery and thus has no second crown hiding the charging nut.
Picture credits: Y. Müller, Visius.com
Provenance: Ex. Hans Baumann collection
Published: Bramaz H.-R., Baumann H.; Die Elektrische Armbanduhr, Band 1, Verlag Stutz Druck AG, Wädenswil, 2013, page 45 picture 5
Electric Watch Prototypes 