RARE LEGO Marbled vintage test brick - Grangemouth, UK 1970s!

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Gray marbled with yellow and red. Has "Pat. pend" and "F 4" underneath. Borg Warner Chemicals in Grangemouth, UK used to provide the Lego factory in Wrexham with their raw materials. In the late 70s, a couple employees at Grangemouth made some marbled bricks to give to local children, this is one of those bricks :) Nice condition, does show some light playwear. Please ask with any questions, or for more photos!