Vintage Gruen: The caliber database » Caliber 847 “Extra Precision”

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Caliber 847 “Extra Precision” - 4.5L [message #12735]

Wed, 01 July 2020 06:30

Case
Messages: 1178
Registered: May 2019
Location: Cincinnati

Gruen Authority

18 Jewels
All Adjustments

This is the first caliber shown in the 1926 Standardized Parts Manual. Barney thought this would be an Aegler caliber, and based on the 4-digit front plate number I think that is true. I have not seen info on any equivalent Aegler caliber from Rolex or another brand.

It is listed as 4.5L. Measures 10.73x17.71mm. I’m guessing this one is ca1923-24.

I had 2 Gruen Factory parts envelopes for this one. They have “4.5L very high grade” written on the front. Thankfully, one of them had an hour wheel, so I’ve placed it on the movement to show. A few more parts before it’s running.

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