lead diameter: 2 mm mechanism: pushbutton spring clutch composition: plastic barrel production date: 1960-70s origin: Japan
GAKKEN PENCIL SAM KNOCK Gakken, Japan
lead diameter: 2 mm mechanism: pushbutton auto-advance clutch composition: plastic barrel production date: 1960-70s origin: Japan
SAM HARDTOP Gakken, Japan
lead diameter: 2 mm mechanism: pushbutton spring clutch composition: plastic barrel, metal grip production date: 1970s origin: Japan
GAKKEN PENCIL SAM LONG Gakken, Japan
lead diameter: 2 mm mechanism (black barrel): pushbutton auto-advance clutch mechanism (red barrel): pushbutton spring clutch composition: plastic barrel production date: 1970s origin: Japan
lead diameter: 2 mm mechanism: pushbutton auto-advance clutch composition: plastic barrel, metal clutch and pushbutton production date: (1990s?) to present origin: Japan