Os and C 27.5 x 21.5inches and M measures approx. 36 x 20.5 inches. And are made of plastic. M has a crack at one joint.Fresh from an upstate NY estate. The item "Vintage Amoco Plastic Letter Store Sign" is in sale since Thursday, June 6, 2019. This item is in the category "Collectibles\Advertising\Gas & Oil\Gas & Oil Companies\Amoco". The seller is "1idolmaker" and is located in Owego, New York. This item can be shipped worldwide.