| Name and Model Number | Curta Calculator Model II |
| Country of Origin | Lichtenstein |
| Date of Manufacture | 1946-1960 |
| Capacity | Setting register =11, Counter register = 8, Result register = 15 |
| Construction | Metal |
| Area of Use | Generic |
| Comment | A series of rotating internal rods reflecting answers on the external registers.
This example has a leather case as well as a metal "can" to protect the calculator. This model was very popular for field work such as surveying. . |
| Rarity | RR |
| Donor | Collection of Clay Castleberry |
| Match Number | 393 |
| 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. |