Cardboard advent calendar Swatch Christmas Special Edition series GZ 900 Pack in Limited Edition, complete with all accessories. Working watch, new, never worn. Polymer case, snap-on top door, spring strap. Warranty certificate included. This piece is attributed to the mentioned designer/maker. It has no attribution mark and no official proof of authenticity, however it is well documented in design history. I take full responsibility for any authenticity issues arising from misattribution