Larger 6x6 A-C Allis Chalmers Porcelain Sign

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Vintage Larger 6×6 A-C Allis Chalmers Porcelain Sign, great looking vintage porcelain sign, this is the larger hard to find version, has some light rust steak, may clean off not sure, has some darker grime near bottom rivet hole also may clean off. Not seeing any chips, this is 6″x6″, back has a dark gray porcelain.