Albumen prints aren't glossy, it's most likely a sepia toned silver gelatin print on single weight (that's quite thin) paper. It maybe a poorly fixed and washed print there were some like that in my Grand-mothers cellar rather than sepia toned. The sophistication of the radio equipment may indicate late 1930's and maybe even the phony war era after Hitler had invaded Poland and war had been declared in Europe.
It'll be a contact print from a 9x12 camera.
In my youth I trained as an army signals instructor which is why I think the equipment is roughly early WWII era or not long before.
Ian