Glenn L. Martin Co. Aircraft Plant - Middle River

Front:
Largest Unit Aircraft Plant in the U. S. A. BAARAAA Glenn L. Martin Co. Aircraft Plant, Middle River, near Baltimore, Md. 9A-H1601

Back:
1. & M. OTTENHEIMER, BALTIMORE, MD. C.T.ART-COLORTONE'REG. U.S. PAT. OFF. 300