This one was made in Nuremberg by Hans Stopler, so I suppose raise a stein to German engineering. Once again it never fails to impress. Revolvers wouldn’t become commercially successful & produced in mass quantities until the 1800s.
https://www.thefirearmblog.com/blog/2016/11/15/worlds-oldest-known-revolver/
Forgive my ignorance, but where would the original owner have bought bullets for this?