Dark Sun: North & South Tablelands Games
A literal boat made of stone that has been sitting on the bottom of the silt for who knows how long. Comes with three stone oars and the promise of transport if you can find a stone captain.
The last owner of the stone boat (where this item was found) was a Lawful & Neutral-aligned halfling male, perhaps 50 years of age, that lost this ship to grounding on hidden rocks. He built the ship himself and with close family some time long ago. The Tablet Contraption were owned and chiseled by the same person. You do get an impression of how it would rest. The divot piece upon the bottom, the piece with the hole above that, and the two other pieces on top of that (but side-by-side).