Vintage MC Escher Relativity Jigsaw Puzzle, 18 X 24 551 Pieces | eBay
My Selegiochi Escher collection 💙.As far as I can see there where 19 of these released.Mostly 1000 piece but a couple of 500s and one 3000. Still searching for the last five.
Mc Escher Relativity Puzzle: 1000 Pcs - Walmart.com
PuzzelMan (819) - M. C. Escher: "Waterfall" - 1000 pieces puzzle
M.C. Escher: Waterfall - 1000pc Jigsaw Puzzle By Buffalo Games (discon) - SeriousPuzzles.com