Gibson 1939 1st Batch EH-185
This is an interesting piece. According to Lynn Wheelwright, there were 50 EH 150/185's from batch 5865-5917. An EH-185, FON EGE 5901 has the triangle non-slip pattern in the back.
The first EH-185 listed is EGE 5907 as a sample C, shipped September 1, 1939. This one pictured was shipped September 14, 1939 to Gene ?ioland. He got two...this one and the other, EGE 5865 (in a private collection).
Furthermore, there are no entries of what Gibson took to the August 1939 trade show.