Model: Beta 21 Reference: 6001 Date: Circa 1975 Movement: 13-jewel Cal.2510 quartz, No.153565 Dial: Sunburst slate grey, applied luminous filled baton hour markers, white outer minute divisions, date aperture at 6, polished baton hands with luminous inserts, centre seconds Case: Brushed and polished oval-rectangular form, back secured by 4 screws, No.100025 Strap/Bracelet: Fitted brushed link Buckle/Clasp: Signed folding clasp Signed: Case, dial & movement Size: 35mm Accompaniments: Audemars Piguet box