This is Doug Haigh’s creation based on a Hoffmann’s classic puzzle (made by Bits & Pieces, long discontinued). The objective is to free the gem.
This is a sequential discovery puzzle.
Please note there is a crack on the inside (see attached photos). It is not visible from distance or at an angle, but I should mention nevertheless.
Buyer please covers the 4.5% PayPal fee.
Shipping: £10 in the UK; £20 in EU; £30 Rest of world.