What is it for??

Hi
try here maybe
http://www.hmvf.co.uk/forumvb/showthread.php?16125-1945-Simms-Dynamo-brushes

Most probably motor vehicle or possibly boat, I used to do simms starters & dynamos as an apprentice..
cheers
Jerry

MT4 on the case may imply mechanical transport.

I think you need a Military Vehicle forum as your dynamo is not an aircraft part.

It’s for a Cromwell tank like mine! Is it for sale?

Dynamo

I used to have a dynamo on my bike, to work the lights. Is that what it is used for on a Cromwell tank?:D

I used to have a dynamo on my bike, to work the lights. Is that what it is used for on a Cromwell tank?:D

More or less!