Audemars Piguet Royal Oak Extra-Thin The Hour Glass, 39mm green dial, Yellow Gold Watch 15205BA.OO.1240BA.01
| Brand | Audemars Piguet |
| Model number | 15205BA.OO.1240BA.01 |
| Series | Royal Oak Extra-thin |
| Case | 18-carat yellow gold case, glareproofed sapphire crystal and caseback, special rotor engraved with “The Hour Glass” logo and the legend “One of Fifty” |
| Functions | Hours, minutes, center seconds, date |
| Case width | 39mm |
| Case thickness | 8.10mm |
| Water resistance | 50m |
| Dial | Green dial with “Petite Tapisserie” pattern, yellow gold applied hour-markers and Royal Oak hands with luminescent coating |
| Bracelet | 18-carat yellow gold bracelet with AP folding clasp. |
| Direction of automatic winding | Bidirectional |
| Number of parts | 247 |
| Power reserve | 40h |