Based On the Original Puzzle Ring
Popularized in 15th century Europe, this ring style was actually used for official engagement and marriage rings.
Christian reformist, Martin Luther, was even known to wear one. It is rumored to prove as evidence of its wearer's adultery, when it comes apart into pieces.
A rich history is matched by a true mental challenge as you try to disassemble then re-assemble these curvy concentric rings.