The Royal Oak Openworked Selfwinding ref. 15305 was introduced at SIHH 2010. It features a dateless, skeletonized version of the self-winding caliber 3120, which is housed in a 39mm case. Reference 15305OR.OO.D088CR.01 has a pink gold case and it's fitted with an alligator strap.
AP 3129 is an in-house, self-winding, skeletonized movement. It is based on caliber AP 3120.