Should I plug it in to see if it works?
NO! Old electrical equipment can be absolutely lethal, and should be treated with great respect. There are two main ways in which something can be dangerous. These are:
The design of the appliance
Nowadays, most electrical equipment is designed to be as safe and foolproof as is possible. This was not the case in the past, and even an item in pristene condition can be dangerous. The main issue tends to be the earthing and electrical insulation of the appliance. This is particularly the case with items that come into contact with water. The most extreme example is perhaps a design of electric kettle produced until the 1950s, which rendered the water inside LIVE when the appliance was plugged in. But there are other issues, like the absence of earthing on an item made from metal, or something like the conductor rods on the HMV Ely electric fire. A solid bar carries the electrical current from the mains to the heating element of the fire. There is nothing to isolate the rods from the metal body of the fire, and they are only milimetres apart. If they were only slightly bent, they could make contact with the body of the appliance, rendering it live, and deadly.
deterioration of the appliance
Everything deteriorates in condition eventually, and electrical equipment is no exception. The insulation of live parts is once again the main problem, and this can affect equipment of any age. Although it is possible for even the oldest electrical appliance to still have intact insulation, THIS SHOULD NEVER BE ASSUMED . The plastic or rubber insulation on the wiring can rot and perish. This is particularly dangerous on the flex of the appliance, which can be bent or kinked, exposing live wires or causing short-circuiting. The external condition of the flex can also be misleading - it can look fine on the outside, whereas the internal insulation can be literally crumbling to powder. If you are in the slightest doubt, DO NOT ATTEMPT TO OPERATE THE APPLIANCE. Collectors tend to know how to check an item thoroughly, and how to ensure that it is as safe as possible.