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Home » The Gruen Model Database » The caliber database » Caliber 719 (15J) - 6.5L x 11L Oval (ETA 425) (Possibly Alpina)
Caliber 719 (15J) - 6.5L x 11L Oval (ETA 425) [message #12749] Thu, 02 July 2020 14:04 Go to previous message
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Another short-lived caliber from the early 1930s. Would it be Alpina? Just a guess based on the finishing, the “Gruen” only branding (no Guild or Watch Co), and the ETA ebauche. References point to ETA 425 as the compatible caliber (can’t verify beyond that too being available as 6.5L, also apparently as a 4.5L)

Seems have debuted for Gruen in 1930-1931. It was used in a limited number of models, have noted only style #s 69, 109, 123.

May have been discontinued within 1 year. Cartouches 504 & 505 are both style # 719/109, both listed in Master Book as caliber 719. But my only sightings all have 835Bs—backs still stamped 719/109 but with the correct movement slot for 835B. They have Gruen house case numbers close to the Master Book model cases (2136xxx vs 2131xxx). My highest actual 719 was case # 2126xxx. Suggestive of a hard conversion/disco.



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