TP-25 military telephone

This telephone was produced for the Czechoslovak army for approx. 80 years without a single modification. It's the local-battery system, so a battery had to be inserted inside. By turning the crank, a small alternator produces current that powers the bell in the opposite telephone. The button on the earpiece has to be pushed to make the voice audible on the opposite side.

Do not touch the contacts, otherwise you may get a serious electric shock.