I believe this to be Charlie Moore’s commissary, which served employees in his milling and coffin building operations. William H. Davidson notes two stores in Junction City in his history of Talbot County.
J. Leonard Morgan’s general store wasn’t open until 1929, and this construction looks earlier than 1929 to me. I think this is what he identified as Marvin J. Hester’s general store, “located in Charlie Moore’s old commissary building“.
That would likely place this structure’s date of construction to circa 1906. It was a condition of Moore’s purchase of the Perkins properties [present day Junction City vicinity] that all structures of that enterprise be removed by 1 September 1906, so Moore likely built this commissary when he established the town.