In the 1950ies, Junghans produced the caliber J99/1, which bases on the caliber J99 but contains an inhouse shock protection system.
This form movement in ladies’ size is a bit bellied, still uses 15 jewels and contains a swiss pallet anchor escapement.
It has got a rather cheap rocking bar winding mechanism below the dial - a detail found on many cheaper pallet anchor watches of the fifties. Technically a yoke winding mechanism is more elaborated and long lasting and can be easier maintained, but on the rocking bar mechanism used here, there’s a helpful detail: The click spring can be moved away without removing the detail, thus allowing the watchmaker to release the mainspring.
|Size:||6 3/4 x 8 1/2'''|
|Number of jewels:||15|
Nickel anular balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Winding mechanism:||rocking bar winding system|
|Setting lever spring:||2 hole(s)|
Flume: 1957 48|