Old Bottle Dyno
 

An old Union dynamo from the Vaterland. Anyone know how to get these open? No, I know they are not worth putting time into, just interested about what is inside.

If there is a way of removing the driving wheel and the base, then they come apart much like a small motor. More modern plastic bodied ones can be a nightmare as the spring mounting system is also in there, but those older ones are a nice little project if you are interested in electrical devices.

These vids may help.