| Name and Model Number | Paisley Calculator Model A |
| Country of Origin | USA |
| Date of Manufacture | 1939 |
| Front Scales | A (left tape) B (right tape) |
| Back Scales | none |
| Scale Length | 20" (50 cm) |
| Type of Rule | Other |
| Construction | Metal |
| Area of Use | Generic |
| Comment | For basic math calculations.
Metal case with celluloid windows front and back and two moveable ribbons arranged side by side containing the scales. Scales rotated by knurled knobs on either side of calculator. |
| Rarity | RRR |
| Donor | Collection of Dr. Paul J. Tarantolo Jr. |
| Match Number | 25 |
| 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. |