J38, pin set, 3/10 jewels, Astra, Indestructible Watch
J38a, pin set, 1 jewel for model Jota, Goodwear Watch
J38/1, stem wind and set, 3 jewels, lever with steel pallets
J38a/1, stem wind and set, 1 jewel for model Jota, lever with steel pallets
J38c/1, stem wind and set, different balance
J38/2, stem wind and set, 4 jewels, shock proof
J38/B, no jewels
Jota registered 1904
Astra registered 1926
J38 Astra, 3 jewels, compensating hair spring, dub teeth escapement with visible steel pallets, gilt plates, well regulated, Junghans catalog 1927.
The watch was sold as defect in a bad condition. I had a NOS face and a cleaning of the case did make a big difference.