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| Item# | Type | Model No. | Model Name | O'Leary Match No. | Maker | Country | Material | Diameter | Date | Condition |
| KEU237 | Pocket | 4018 | K&E Pocket Calculator | 4042 | Keuffel & Esser | USA | Nickel-plated brass | "2""" | 1909 | C7 |
Notes: "Similar construction to Sperry's calculator, but with different scales sets. Patent Applied For notation. Long stem rotates cursors, larger wheel rotates scale discs."
Click on the Condition Code to obtain more details.
