From the circuit board of a 1985 Volkswagen engine control unit...
I can't find the device itself based on the markings. Does the silkscreen help?
Hmmm, actually it looks like this must be it:
http://www.datasheetspdf.com/PDF/BCX58/127619/1
Based on that datasheet, the silkscreen is indicating E - B - C (left to right).
Is that marking still in use today?