This is a rare men's 18K Audemars Piguet Royal Oak Day Date Moon Phase Automatic wristwatch with box and papers, Circa 1990's.  The watch features a massive octagonal 18K yellow gold case attached to a sectional "brick link"  Audemars Piguet bracelet with concealed deployant clasp that measure 7 1/4" long.  The watch has a three-piece case with back and bezel secured by 8 white gold bolts, screw-down hexagonal winding crown, topped with a sapphire crystal, Ivory white dial with clous-de-Paris decoration (waffle pattern), applied yellow gold luminous baton indexes with double subsidiary dials for the date and days of the week and a moon phase aperture.  The watch has a high grade Swiss Audemars Piguet Automatic Cal. 2825 movement, 38 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance wheel that is in good running condition.  As you can see from the photos, the watch is in overall excellent condition.  The watch is accompanied with the original fitted box and papers.