The movement shown above is produced after 1936 because the escape wheel cock is not separat, but before 1949/50 as from this time the shock absorber has been installed.
The Junghans J80/2 and later the J80/5 had the finest movement fitting and awarded the title "Meister". The movements were equipped with a ribbing, but also movements of the caliber J80 were provided with ribbing, which are not delivered in "Meister" -execution.
The movements were produced at the same time with or without divided wheel bridge. There are versions with 7, 11, 13, 15, 16 and 17 jewels.
There's caliber Junghans J80 with various imprints on the bridge: J80S; J80M (was probably Meister).