| Name and Model Number | A. M. Maurand Prompt Calculateur |
| Country of Origin | France |
| Date of Manufacture | ca. 1865 |
| Capacity | Simple calculations and conversion of units |
| Construction | Brass box with glass lid and hand colored cardboard tables |
| Area of Use | Other |
| Comment | Universal Ready Reckoner.
Awkward to handle. Also mentioned in Comptes Rendus des Séances de l'Académie des Sciences. Paris. 61, 425. |
| Rarity | RRR |
| Donor | Photo from a collection in Germany |
| Match Number | 77 |
| Thumbnail (Click Picture for Details) |  |
| In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen |
| (1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD. |
| • RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace. |
| • RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale. |
| • RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale. |