| Name and Model Number | Faber-Castell 377 System Pickworth |
| Country of Origin | Germany |
| Date of Manufacture | 1909 - 1915 |
| Front Scales | A, B, C, D |
| Back Scales | K in a window on the back side of the slide rule |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Celluloid on boxwood |
| Area of Use | Generic |
| Comment | Idea for position of K scale by Charles Pickworth. |
| Rarity | RR |
| Donor | Photo courtesy of Peter Holland, Germany |
| Match Number | 43 |
| 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. |