| Bidder | Amount | Date | 
|---|---|---|
| m****g 77 | €12.00 | 14.09.2019 11:28:39 | 
| m****n 273 | €11.00 | 14.09.2019 02:34:52 | 
| m****g 77 | €10.00 | 13.09.2019 21:39:17 | 
From the set of IPP37 exchange puzzles this is "Dondrian Square", Exchanged by Stan Isaacs..
 A difficult 2D packing puzzle, see second picture for details.
 The transparent tray measures 15x15 cm.