Sam Barnes (1847-1926) lived in Havre d Grace, Md, where he worked as a decoy maker, gunner, and fisherman.  This particular decoy was from the rig of Glenn L. Martin, an American aviation pioneer from Baltimore, MD.  Martin was a pilot who designed and built aircraft; he founded a company that became the aviation leader Lockhead Martin.  The decoy has the GLM brand on its bottom.