The Dietzgen No. 1768-P is a vintage pocket slide rule produced by the Eugene Dietzgen Co.

With original manual.

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It features a distinct contrasting mint-green or green plastic slide, a single-sided or simplified scale layout (such as A, B, CI, C, D, K, S, L, T), and was manufactured in various locations over its lifespan, including the USA, Japan, and later variants.

Historical Context & DesignBrand: Eugene Dietzgen Co., a major American drafting and engineering supply competitor to Keuffel & Esser.

Model Designation: 1768-P (often designated as the "Reliance" or "Maniphase" pocket rule).

Physical Build: Compact plastic pocket construction with a characteristic light green slide face.

Production Eras: Reissued across different decades, with versions produced domestically in the U.S. (including WWII-era variants) as well as later production runs manufactured in Japan.