| Name and Model Number | Fowler’s Long Scale Calculator |
| Country of Origin | England |
| Date of Manufacture | unknown |
| Front Scales | Short Scale; Long Scale (6 circles) |
| Back Scales | none |
| Scale Length | Long scale ~ 30” (76 cm); Short scale ~ 7.5” (19 cm) |
| Type of Rule | Watch Type |
| Construction | Metal with paper scales and glass window, |
| Area of Use | Generic |
| Comment | Single sided pocket watch calculator with two stems to rotate paper scale and cursor.
Fixed cursor on glass face. Rare single sided version. Most Fowler’s Long Scale calculators have scales on both sides. Blankenhorn and De Cesaris Model 2MG2b. |
| Rarity | RRR |
| Donor | Collection of Dr. Paul J. Tarantolo Jr. |
| Match Number | 19 |
| 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. |