Titanium Audemars Piguet watches

The Titanium Field Guide lists 1 titanium Audemars Piguet watch, around $196,000. Every entry is verified for titanium content, sourced against the maker, and dated.

• Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium)
  Titanium (grade undisclosed) · 41.0 mm · AP calibre 5135 · $196,000