This is a Marbled, Tie Dye 1970's Grangemouth, Scotland Test 2x4 LEGO® Brick

This is Red with white & blue swirls.

There are a couple of this pattern available and they are all unique. The photo is representative of the brick you will receive but may not be exactly the same.

These are F Mold Pat pend bricks from the 1970's made by the Borg Warner Factory in Grangemouth, Scotland. The Borg Warner factory made the ABS plastic pellets that they supplied to the Wrexham, Whales factory to make legit LEGO® bricks. In the 1960's, LEGO® gave the Borg Warner plant 2x4 brick molds so they could make test bricks to test their plastic pellets. The factory workers took the test bricks home and gave them to their kids and neighbors kids to play with. Factory workers made solid color test bricks along with some odd non-traditional LEGO® color test bricks. They even got a little crazy and made marbled bricks by mixing multiple colors together. The majority of the Grangemouth bricks found in the wild today came from local children's toy collections and are well used. Our bricks all have play wear on them including scratches, dents and dings. 

For a more details about the Grangemouth bricks, read our blog post on the subject!