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“Ecobra” (unknown model)

Ecobra, Germany

lead diameter mechanism composition variations production date origin	2 mm pushbutton spring clutch molded plastic barrel, metal fittings unknown (1970s) Germany

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Ecobra Drawing Leads

Ecobra, Germany

lead type lead size package quantity package composition available degrees/colors production date origin	graphite 2 mm 12 plastic box unknown range (1970s) Germany

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Ecobra 836601

Ecobra GmbH, Nürnberg, Germany

lead diameter mechanism composition variations production date origin	2 mm pushbutton incremental advance clutch platic barrel, metal mechanism none 2000s (Germany)
special features	lead pointer in removable pushbutton

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Ecobra 836703

Ecobra GmbH, Nürnberg, Germany

lead diameter mechanism composition variations production date origin	2 mm pushbutton incremental advance clutch plastic barrel and clutch(!), metal nosepiece and pushbutton none known 2000s (Germany)
special features	lead pointer in removable pushbutton

This is the only pushbutton style pencil I can think of that actually has a plastic clutch. There are several types of twist-lock leadholders with plastic jaws such as this ancient model.