All about Gruen

[Fred]

This may have been shared before, but does anyone recall the caliber number? The movement build looks turn of the century . The dial… much later

https://empress.cc/products/20s-gruen-slim-mop-platinum-diamonds-swiss-pocket-watch?

[Mr. Bieser]

Yeah, last time I saw this watch, 7710, it had a white dial on it.

As far as I know this calibre, and maker, is still unknown.

[Mr. Bieser]

Perhaps this could be of use? Another example of unknown w serial from my db.

[Fred]

Ah, yes! Good memory—and good records!

[Mr. Bieser]

Ah, yes! Good memory—and good records!

Sometimes! Had some big losses over the years but...,I try

[Dietrich]

This movement seems not to be listed in any official Gruen documents. So I do not have a Gruen caliber number either.
Nathan Weil appears as a suspect for these watches to me. Later they were renamed to Casy Watch Co.