Vintage Armstrong DP 1Railroad Glass Insulator Light Cover. Very nice threaded Armstrong glass insulator consolidated design style 155 with no chips or cracks and just small scratch on the one side. Please see photos for condition.

Stamped 'Armstrong DP 1' and 'Made in U.S.A. 73 61.' Great to add to your collection or . as a paperweight

Armstrong Cork Corporation purchased Whitall-Tatum in 1938 with insulator existing molds re-engraved with the ARMSTRONG name between 1946 and 1949