Vintage Gruen: The caliber database » Caliber 647 (Record)

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Caliber 647 (Record) [message #11497]

Tue, 22 October 2019 17:17

afire
Messages: 1404
Registered: May 2013
Location: Wisconsin

Gruen Authority

You guys are going crazy with a caliber database, so I figured I should try to carry my own weight.

Here's a relatively uncommon one, the 17 jewel Watch Specialties Co. caliber 647. I'm guessing it was in use from the late teens to early twenties. I think my ID as Record 022K is solid. The distinctive bridges and setting parts seem identical to me. The 647 shows up as a movement option for plate 23-B (Strap 1 style) in the 1918 book, but the case is more like the 23-C with conventional lugs.

This example has a serial number of 858749 and in a sterling case with a serial number 567414. I'm guessing the case was Cincinnati made. It doesn't have any Swiss or other markings.