| Name and Model Number | Pickett Model 525-ES LOROP |
| Country of Origin | USA |
| Date of Manufacture | c. 1960 |
| Front Scales | Specialized Csc1, Sec1, D [ E, Csc2, Sec2, K, C ] J, Q, Qa |
| Back Scales | Specialized A, D, Cot/Tan [ C, CI, B ] C+, C-, C* |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Aluminum |
| Area of Use | Photography |
| Comment | LOROP = LOng Range Oblique Photographic camera.
Oblique Photography Mensuration Slide Rule. This extremely uncommon slide rule may be RRRR = Extremely Rare -- a museum piece; unlikely that an example will come up for sale. |
| Rarity | RRR |
| Donor | Collection of Ron Knapp |
| Match Number | 253 |
| 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. |