Cast in aluminum, this sign measures approx. 10 5/8" x 4.5". This particular sign was cast flat, but it is available with Pennsy style pole mount and webbing on the back.
Also in 3" scale are keystone whistle posts, ring posts, triangular flanger signs. These are available from the Odd Duck Foundry, in Orrington, Maine. http://www.oddduckfoundry.com/
Neat collectibles for Pennsy guys and live steamers!