Calibers 145-6-7-8-9, 15-17 Jewels, 9.75 Ligne

Shape: round
Signature: Gruen W. Co
Maker/Supplier: Factory T
Cleves proposed intro date: 1920

Details: 9.75L sisters to the 10.5L "Gruen Guild" Cal 266 & 267 (seen stamped "Factory T"), with matching serial number series, font, and placement on dial side. Cal 145 grouped in this by Cleves, referencing internal Gruen docs. Cals 145, 146 & 147 are 15J; Cals 148 & 149 are 17J. Unknown differences within groups: could be with/without sub-seconds, as no open-face configuration has been seen.

145, 146, 147 example (HC dial back stamped "146")

148-149 example (shown in 1926 parts sup B)

Differentiation (vs. 266/267): I note 5 ways
- Size: 22.0mm (vs. 23.7mm)
- Hole near edge of plate, between balance & smallest finger bridge (vs. no hole)
- Location of "Suisse": between middle bridges (vs. next to balance)
- Marking: Gruen W. Co (vs. Gruen Guild) --> unknown if always true
- Shape of Middle Bridge end --> pics below, 266/267 neck seems longer & tip more "arrow head"

146-149

146-149 tip.JPG (10.99 KiB) Viewed 22 times

266-267

266-267 tip.JPG (8.4 KiB) Viewed 22 times

Nice presentation, thanks. Helped straighten some lingering questions I had on the calibre's.