Looks like an albumen print, very yellow in parts, quite glossy and flimsy paper base. Paper size 9X12cm+/-
Perhaps someone recognises the types of uniform & radio equipment that may put a picture like story to this photo & date it.
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.
All the vacuum tubes (valves for those of you across the water) in that equipment are globe types. That suggests to me that this could be earlier than late thirties.
Thanks to those chipping in thus far.
Maybe someone may recognise the uniforms (army or other and nationality). Let's let it ride to see what else is coughed up.