18x18 I believe this is an early flange sign enameled one side is very nice with hairline cracks the other side has several large cracks in the enamel. Light surface rust on edges. The item "C1900 1921 BELL SYSTEM DOUBLE SIDED FLANGED COBALT BLUE PORCELAIN SIGN RARE" is in sale since Monday, October 17, 2016. This item is in the category "Collectibles\Advertising\Merchandise & Memorabilia\Signs\Original\Pre-1930". The seller is "gogel1835" and is located in New Hartford, Iowa.
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