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Home » The Gruen Model Database » The caliber database » 18J Extra Precision Oval (Unknown) (measures 18.6mm x 12.65mm or roughly 8.25L x 5.5L)
Re: Caliber 151 - (Extra) Precision - 5 1/2 '" [message #12784 is a reply to message #12783] Mon, 06 July 2020 13:45 Go to previous messageGo to previous message
thesnark17 is currently offline  thesnark17
Messages: 654
Registered: January 2017
Gruen Master
One thing I can say - that serial number lines it up with the Dietrich Gruen labeled pocket watches. The early 19j Ultra-Thin, Up/Down, Minute Repeater, and Minute Repeater Chronograph are all in the SN range 41k-42k.

So my first thought is to look up the maker for those watches.

[Updated on: Mon, 06 July 2020 13:46]

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