| Name and Model Number | Selectron Model A |
| 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 | This Model A is very hard to find,
its all black face with white scales is perhaps the more usual layout, but makes for a very attractive and unusual slide rule. |
| Rarity | RRR |
| Donor | Collection of Conrad Schure |
| Match Number | 36 |
| 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. |