| Name and Model Number | Chadwick – Swiss Army Slide Rule |
| Country of Origin | Japan |
| Date of Manufacture | 1950 - 1960s |
| Front Scales | A B Ground speed |
| Back Scales | None |
| Scale Length | 9.5 cm (3.7 in) for the longest scale |
| Type of Rule | Slide Rule |
| Construction | Circular slide rule, knife blade, fingernail file and money clip |
| Area of Use | Generic |
| Comment | A novelty slide rule for the flying trade. See JOS v18-n2-2009- Title: Multitasking Slide Rule for the 1950s
|
| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 328 |
| 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. |