| Name and Model Number | Merrifield Gunter Rule |
| Country of Origin | USA |
| Date of Manufacture | c.1850's |
| Front Scales | see images |
| Back Scales | see images |
| Scale Length | 61 cm (24 inches) |
| Type of Rule | Slide Rule |
| Construction | Striped maple rule with brass edges. 61-cm x 4.5-cm |
| Area of Use | Nautical |
| Comment | Unusual brass-bound rule. Wood has orange-redish color with stripes. See closeup images. Needs dividers to make calculations. Signed Merrifield & Co. New-York |
| Rarity | RRRR |
| Donor | Collection of Ed Chamberlain |
| Match Number | 375 |
| 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. |