| Name and Model Number | Comptator Adding Machine |
| Country of Origin | Germany |
| Date of Manufacture | c. 1920 |
| Capacity | 13 digits |
| Construction | metal |
| Area of Use | Generic |
| Comment | Stylus is inserted in toothed slides and moved downward for addition.
Size 60 x 205 x 32 mm. Weight 750 g. Has automatic carry mechanism. |
| Rarity | RR |
| Donor | Collection of Gary Flom |
| Match Number | 392 |
| 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. |