Robrecht's Puzzle Design Competition for IPP28 in 2008, with 80 copies made a year later by Eric.
original description: https://cubicdissection.com/products/copy-of-la-cerradura-double.
♫:
▪ everything i have is in the photos.
▪ buyer pays shipping, calculated after the auction.
▪ shipment is by USPS Priority Mail, insured for the full sale price, and trackable.
▪ payment via PayPal only.
▪ all puzzles in my collection have been kept out of sunlight, in a humidity-stable room or sealed plastic container, away from pets unless they can solve them, and in a non-smoking household.
thank you for looking, and good luck if you bid.
:cameron: