This is the Bits and Pieces Brass Cannon puzzle. It is a much better version of the modern version, as none of the steps can be cheated or accidentally found. It is quiet rare. Absolute must for any collector.
Probably the Bits and Pieces version rather than the En-Deavour (which were a limited run made by Rocky).Mechanism works well. Very tricky.Shipping is $6 UK and $18 elsewhere.