The green bricks on the left are “old logo Bayer”.
The red bricks on the right are “old logo BASF”.
The white and light tan brick in the middle are an unknown mold. The bricks are made from a hard plastic and make a glassy sound similar to many of the BASF bricks.
These bricks were a flea market find in Denmark.
Check your “hard plastic old logo Bayer bricks” 🙂
The molds are very similar, so there might be a few of them hiding in our collections.
[Original post and comments on Flickr.]