12 Ott ZENITH D. H.
CASE . Two types :
– stainless steel, 35 mm ;
– chrome plated, 35mm .
BACK . screw, steel .
Outside reports the S/N only . Inside there are : “zenith” and “ acier inoxidable” .
In some cases , inside , there are also : “brevet” and the Swiss cross .
MOVEMENT . Zenith “Cal. 12.4.6 “ .
Brand name and the S/N of the movement
It does not have the movement stop ring but a dust-cover
CASEBACK MARKINGS: D. H. only .
Letters and numbers have the same size (2mm) and punching is semi-circular .
S/MN . 7 digits . It is assumed that the first three numbers can identify the batch
while the next ones are the true S/N .
From the registered watches (109) there were 4 possible batches with the following ranges :
1. 83720XX / 83796XX stainless steel case ;
2. 83802XX / 83813XX stainless steel case ;
3. 83940XX / 83995XX steel for low S/Ns , chrome case for the following ;
4. 8400XXX / 841XXXX chrome plated case .
NOTE . Batches and ranges are purely indicative .