Clare Gaylard Glass 

This does it for me, a miniaturised, working process that spring to life when you drop a penny in. Literally any penny, so that's value for money too. This delightful automata is the replica of an original by George Wood made in 1889 with caricatures of his fellow workers (their heads carved from pipe bowls) and it shows the stages of refining jet into jewellery. Find it in Whitby Museum.