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| Item# | Type | Model No. | Match No. | Variant No. | Model Name | Maker | Country | Production or Serial No. | Material | Scale Length | Date | Condition |
| KEU465 | Linear | 4058 | 4153 | 7a | Student's | Keuffel & Esser | USA | n/a | Boxwood w/printed scales | "10" | 1923 | C4 |
Notes: Student's Slide Rule added over table on back. Variant 7 has xylonite indicator while 7a has a frameless glass indicator with wood guides. This is first occurrence of this type of indicator.
Click on the Condition Code to obtain more details.
