In the 1950ies, the Diehl Group bought Junghans and started to sell watches with their own movements. Those Diehl movements based on Junghans movements, but were made a little bit cheaper, mostly by getting rid of some synthetic rubis.
The Diehl 620 is a true Junghans construction and bases on the Junghans caliber 620. The balance and escapement part are the same, but on the rest of the movement, there are no jewels, but brass bearings.
From the construction, it is a pretty modern movement with large (not very service-friends) main plate and parge ring balance with three legs, which is beared in two Star-Shock proctection systems. On the other hand, the small decentral seconds indication is pretty much outdated.
The rhomb-shaped order of the four gear-wheels is interesting. It allowed large dimensions of mainspring and balance and still left plenty of free space.
|Number of jewels:||7|
Nickel anular balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Hairspring key|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Functions:||hour, minute, decentral second|
Flume: K3 -|