| 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 |
| Thumbnail |  |
| 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. |