Full Details

Name and Model Number Selectron Model B
Country of Origin Switzerland
Date of Manufacture ~1960
Front Scales C/D
Back Scales None
Scale Length ~ 16 cm
Type of Rule Watch Type
Construction metal
Area of Use Generic
Comment Made by Ollech & Wajs in Switzerland as a cheaper alternative
to the more expensive Breitling stop watch devices,
this Model B is better known than the much rarer Model A.
Rarity RR
Donor Collection of Peter Hopp
Match Number 37

RR = Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.   
RRR = Very rare -- only very few known to collectors; may take several years before one comes up for sale.   
RRRR = Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.