13 Ott HELMA DH
CASE . Chrome plated , 33 mm .
BACK . Screw , steel .
It is marked with the S/N and the manufacturer’s symbol ( helm)
MOVEMENT . AS 1130
It is often anonymous . In some cases , the brand’s name is on one of the bridges .
PUNCHING . D.H. only .
It is small and uniform ( 1mm ) .
S/N . 5 or 6 digits .
By the number of registered watches ( 95 ) there may be six batches :
– 5 digits , 3 batches :
. 001XX / 022XX ;
. 045XX / 076XX ;
. 088XX / 170XX .
– 6 digits , 3 batches :
. 0023XX / 0058XX ;
. 016XXX / 033XXX ;
. 040XXX / 045XXX .
1. This brand was one of the very few German Company to supply watches of this type to the Wehrmacht.
The great majority of Companies were Swiss .
2. Helma , with Glycine and Helios , is among the most common D.H.
3. Batches and S/Ns are purely indicative .