The reference 5726A was released at BaselWorld in 2010 and was offered originally only on a strap. This annual calendar features a black ribbed dial with applied white gold indexes with superluminova. In 2012, Patek Philippe began producing the reference 5726/1A which was made with a bracelet and lighter colored dial. The presently offered example was manufactured in 2011 and was sold by Tiffany & Co. in Honolulu, Hawaii. Fresh to the market, it features the coveted and rare Tiffany & Co. signature placed within the subsidiary date dial.
For another example of this reference, see Patek Philippe Steel Watches by John Goldberger, p. 392-393.