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3500

C-Thru, Grand Rapids, Michigan, USA

lead diameter mechanism composition variations production date origin	2 mm pushbutton spring clutch plastic barrel, metal clutch and pushbutton barrel color: black, blue, (green), red, yellow 1990s Italy
special features	lead pointer in removable pushbutton
see also	Alvin "Scott" B/2 Tacro 3349

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3502

C-Thru, Grand Rapids, Michigan, USA

lead diameter mechanism composition variations production date origin	2 mm pushbutton incremental advance clutch plastic barrel, metal clutch and pushbutton barrel color: black, blue, red, yellow (early 1990s) Italy
special features	lead pointer in removable pushbutton
see also	Lutz No. 3502

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3502

C-Thru, Grand Rapids, Michigan, USA

lead diameter mechanism composition variations production date origin	2 mm pushbutton incremental advance clutch plastic barrel, metal clutch and pushbutton barrel color: black, blue, red, yellow 1990s Italy
special features	lead pointer in removable pushbutton
see also	Alvin Tech-Matic T-4