I did get a lot of old school stuuf when I bought one Ericsson telephone.
Most of these are produces before WWII.
Makes are "Mäkinen Sortavala" and "Koulutarpeideb keskusliike".
Some ot these I know like two coal bar microphones, meter, motor, resistor, jacob's laders, battery, electonic magnets.
The adjustable coil in front I do not know.