| Name and Model Number | Aristo 80123 Martin Space Rule |
| Country of Origin | Germany |
| Date of Manufacture | ~1962 |
| Front Scales | 5 specialised [3 specialised, C] D, 2 specialised |
| Back Scales | 12 specialised [6 specialised] |
| Scale Length | 14.0 cm maximum |
| Type of Rule | Slide Rule |
| Construction | Plastic |
| Area of Use | Other |
| Comment | A rule for space and orbital calculations. |
| Rarity | RRR |
| Donor | Collection of Rod Lovett |
| Match Number | 8 |
| 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. |