Vintage Gruen: The caliber database

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The caliber 707 [message #671]

Sat, 15 June 2013 16:11

JackW
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Registered: May 2013
Location: Denver

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The caliber 707 is a 15 jewel movement and is 12-1/2 ligne or 28.4mm in diameter. The caliber 713 is a 7-jewel variant of this movement. Although these are commonly marked on the pillar plate with the caliber number, usually in the space between the escape wheel finger and the balance wheel, occasionally they are unmarked.
Photographs by MikeyT.
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