Wednesday, May 8, 2019

Vintage Gruen Precision watch with Cal. 510 RSS movement

I acquired another Gruen Precision from the 1950s. The previous owner indicated it to be from around 1955 so this is about 64 years old. It is in very good shape with what appears to be reapplied lumes. This is my 3rd Gruen Precision watch and can easily be part of my rotation.

Simple watch dial with no day or date features
Side view showing the crown
The other side view
Case back showing the watch to be waterproof, shock resistant, anti-magnetic
Gruen caliber 510RSS movement running at 18,000 bph over what was originally 42h when fully wound.
Here's a wrist shot of the vintage watch
The watch runs a bit fast, gaining more than a couple of minutes per day. I haven't had the chance to have it serviced recently but it is in pretty good condition and should be no trouble to repair/adjust.
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