Padlock made by Slaymaker Lock Company for Conestoga Traction Company. Brass with key, attached by a chain. Ring and screw attaching chain to lock and key are steel or aluminum and probably replaced. Rivet construction. "Slaymaker Lancaster PA" is stamped in hasp. Spring hinge cover of keyhole. On reverse, raised portion that mimicks keyhole cover is stamped "C.T.Co."
overall oxidation that darkens the brass -- greenish cast in a few places. dents along edges of lock and on keyhole cover. bolt and keyring attaching chain to lock and key is likely a replacement.