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  Alvin "Tech" A1
  imprint reads: Tech - A–1; reverse: Germany

Tech A1

Alvin Co., Windsor, Connecticut, USA

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
plastic barrel and pushbutton, aluminum nose, brass clutch
8 pushbuttondegree imprints: HB, F, H, 2H, 3H, 4H, 5H, 6H
circa 1970
Germany
 
see also Alvin Company catalog, 1971, p 79
 
  imprint reads: * Tech-DA "De-Lux" Germany

Alvin Tech-DA "De-Lux"

Alvin Co., Windsor, Connecticut, USA

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
plastic barrel and pushbutton, metal nose/grip and mechanism
8 pushbuttondegree imprints: HB, F, H, 2H, 3H, 4H, 5H, 6H
circa 1970
Germany
 
see also Alvin Company catalog, 1971, p 79
Is the name of this thing a joke?
  Alvin "Tech" Da De-Lux, blue with red button
   

Alvin “Tech” DA De-Lux

Alvin Co., Windsor, Connecticut, USA

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
plastic barrel, aluminum grip, chrome plated brass fittings
colored pushbutton: black, red, ?
(1990s) to (2000)
Italy
 
see also Koh-I-Noor 5611 (plastic)
Tacro 4434 and 4435
In the 1980s this model was black plastic.

Flash:
This pencil is still being produced (2006) but the name has changed. It's no longer "Da De-Lux," it's just "Da." True story. I have one and will put it up someday, but I must confess, it's down a few miles on the priority list. Apparently someone at Alvin realized that calling this thing De-Lux was belittling to their Pro-Matic De-Lux and Techmatic De-Lux metal barreled leadholders.

Alvin "Tech" Da De-Lux, blue with red button package