Here is information on the small red tin AH 100 model.
These were originally made in Western Germany and the company did not do
well with them. The rights and Litho were sold to a company in France named
Joyax Jouet. They produced them with the friction drive, and then without the
drive but still with the notch for the drive on the bottom. Eventually even
notch disappeared and they had 3 or 4 different bottoms. They came in the red
as in your photos and in a light green which I would like to get. They were
sold individually and in sets; one set with a transporter, Mercedes, and
airplane: and one set with a gas pump. If you would like I could do a little
article about them for the magazines.