Mistery device: Can anyone ID/date this motor/generator please?1

This piece was sitting at our shop, dusty and forgotten in a tool closet. It suddenly caught our attention the other day and we decided to clean it up and research about its original function.

We couldn’t find anything about it on the Web, nor the name on the shield or any similar gadgets. Maybe some of you know what it is and can help us date and precisely identify this piece? It is really well built mechanically and quite heavy as you can guess.

We thought it could be part of an old German automobile generator? What application could this have?

It does generate about 12V RMS pulsed DC at about 2500 RPM(driven from a drill attached to the axis) with the coils connected in series and then the coils in parallel with the brush / rotor windings. We tried a few combinations of coil and brush hookups. The coils heat up minimally hooked up to a 12V car battery. The wire in the rotor windings seems to be 1mm in diameter approximately(we did not take it apart).

The nucleus is solid, not laminated. We could not measure the inductance of the coils because our only inductance meter was accidentally inserted into a 220V socket…The nucleus is closed by a magnetically isolating plate made of brass. Every other piece attached to the nucleus is also magnetically isolating, all likely brass.

Face plate(shield) says
CLIMAX
Bachrich & Co
Hamburg Wien

Well, here it is. Any information greatly appreciated!