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The caliber 480 [message #2064] Fri, 01 November 2013 10:42
Thojil is currently offline  Thojil
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Registered: May 2013
Location: Concorès, France
Gruen Master
Caliber 480 is a 17-jewel patented Auto-Wind movement and is 9-3/4 ligne by 11 ligne (453 Material Catalog). Two other variants exist, the 480SS (sweep second) and the 480-3SS (23 jewel sweep second).

It was introduced in 1951 according to Barry C. & Mike B. dating table and was the first Gruen Auto-Wind caliber with a 360º rotating rotator. Inventor of the new winding mechanism was Henri Thiébaud (Patent US2661591).

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