| Name and Model Number | Molter Slide Rule 8406 Type 2, Mid Variant |
| Country of Origin | Germany |
| Date of Manufacture | c. mid 1920s |
| Front Scales | A C [ D ] |
| Back Scales | n1 n3 tg sin log |
| Scale Length | 13.4 cm |
| Type of Rule | Watch Type |
| Construction | Metal housing with scale discs sandwiched between two movable celluloid discs with inscribed cursors. Inner D scale on front is rotated by center knurled control knob. |
| Area of Use | Generic |
| Comment | Mid variant distinguished by unslotted center knob and opaque cursor grips. |
| Rarity | RR |
| Donor | Collection of Dr. Paul J. Tarantolo Jr. |
| Match Number | 211 |
| 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. |