| Name and Model Number | Charpentier Calculimetre |
| Country of Origin | France |
| Date of Manufacture | Before 1900 |
| Front Scales | C, [D], [R] |
| Back Scales | L, S, T |
| Scale Length | 5.9 cms Diameter |
| Type of Rule | Disc |
| Construction | Steel and Copper |
| Area of Use | Generic |
| Comment | |
| Rarity | RR |
| Donor | Collection of Rod Lovett |
| Match Number | 17 |
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| 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. |