Shell Tanker/Station Toys

Picked up this little set pretty cheap. It has a small Shell Tractor/Tanker and a flat service station. The only markings are the Shell sticker and "Made in W. Germany." Can't say who made it or era for sure, its got the 50/60's plastic feel, you can tell the newer stuff. A station promo ? I like simple small stuff with good colors like this. Don't know if there were any other pieces to it, a classic Shell logo sign would have been cool.

Thanks,
Bill