Audemars Piguet Royal Oak 8638SA Automatic in Steel & Gold Case

Brand: AUDEMARS PIGUET 
Model: ROYAL OAK
Reference: 8638SA
Year: 1990s
Metal: YELLOW GOLD & STEEL 
Dial: GREY
Bracelet/Bezel: ROYAL OAK BRACELET
Case Size: 29MM
Box/Paper: NONE
Condition: VERY GOOD