The core of this puzzle is a very unique mechanism, one I've never seen before or since!
This puzzle is available, new, from the original creators, at a cost of 55 British pounds (which is roughly 75 USD currently). Therefore, my copy will be sold at a lower price.
Kept in a smoke-free, pet-free home.
Buyer is to pay for shipping, DO NOT PAY until shipping cost has been determined and added to the invoice.
I am selling 9 items currently (must reduce collection size, thinking about a move), if you happen to win any of the others, shipments will be combined to reduce postal price.