Yuk, I can imagine the condition of the old building and the wiring from my days in the Netherlands and some work i have done in Northern France near Reims.
Very interesting photo's. A good variety of 10, 16, 20, 25 and 35 Amp diazed fuses here.
The polyphase kWh meter looks very new to me. I was expecting to see an old Landis & Gyr MG1 series meter here.
The product of rotation, excitation and flux produces electricty.