This unmarked photo was found in an old box of QSL cards that someone sent me. Going by the age of the equipment, the operators are probably SK. You can see a callsign displayed above the meter on the transmitter. It looks like W9AQB, or perhaps W9AGB.

W8SU wrote:
Tom, the unknown photo you have posted it is either W9AOD who was Orville Hampton, Glen Ellyn, IL, or possibly W9AQD James Thomson Chicago, IL, Glen Ellyn is a sub of Chicago area, out of a 1936 call book. The district is not in the 10th district because there was no Tenth then. Some tone adjustments brought out a lot of the lettering.
If it is W9AOB, I have a QSL card. This guy W9AOB is using type 210 same as in the picture! The unknown picture shows the board built layout that was the style of building in the 1930's.

K8CX