The small form caliber number J 73 is a fairly simple one. It uses an anchor escapement and a nickel balance, beared in a Junghans shock protection system, but all bearings only consist of metal instead of synthetic rubies. The windingsystem is simple, too, it it just a rocking system.
The large gears are remarkable, too. They allow a simpler design.
A different version of the caliber J 73 is fully equipped with 17 jewels, thus allowing a broad range from cheap to expensive watches with the same base movement.
|Size:||6 3/4 x 8'''|
|Number of jewels:||5/17|
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|
|Mentioning in literature (years):||1961|