years for the 1.5?

Very interesting, developed by Porsche ?

For the 1.5, 1958-1963 its the most probably.
@ tak: have Porsche pieces, but its a local design by Teram. Sorry, but in Spanish the interesting story for Teram, a Porsche dealer and agent. www.autohistoria.com.ar/Historias/Teram_Porsche.htm
Its funny, but Ferry Porsche nickname this car as "der indianer Porsche" LOL!