Old HP Logo question


I recently picked up this penknife on ebay which I know is an HP long service award given to members of staff for 5 or 10 years service. Does anyone know when this style of logo was in use in HP? Im sure it predates 1980 but I dont know exactly when. Does anyone know?


The parallelogram with the "h" and "p" letters inside is all through a 1970 HP catalog I have at home (Electronics for Measurement, Analysis, and Computation), which means the trapeze-shaped logo on the penknife is even older. 1960?

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