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| Item# | Type | Model No. | Model Name | O'Leary Match No. | Maker | Country | Material | Diameter | Date | Condition |
| KEU187 | Pocket | 4017 | Sperry Calculator | 4651 | Keuffel & Esser | USA | Nickel-plated brass | "2""" | 1909 | C5 |
Notes: "E. A. Sperry's calculator - patent notation Oct. 25, 04. Long stem rotates cursors, larger wheel rotates scale discs."
Click on the Condition Code to obtain more details.
