Audemars Piguet
Royal Oak RD#2 Perpetual Calendar
Reference 26586BC.OO.1240BC.01
$780,000
9.0
Excellent
Available
Year
2019
Caliber
Calibre 5135
Case
41mm 18k White Gold
Dial
Slate Grey
Bracelet
Integrated White Gold Bracelet
Condition
9.0
Excellent
Condition Notes
Audemars Piguet's ultra-thin perpetual calendar research concept (RD#2) — Cal. 5135 measures just 2.89mm thick. Original papers, AP extract from archives, and presentation box. Light hairlines on case only.
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Reference Price History
Based on 12 tracked sales across major marketplaces
Buy / Sell Spread
Ask (CrownDial)
$780,000
/
Indicative Dealer Bid
$700,000
/
Spread
10.3%
Why This Premium
RD#2 ultra-thin perpetual calendar in 18k white gold — Audemars Piguet's research concept that proved 2.89mm-thick manufacture possible. AP extract from archives included. Production run is finite (low hundreds); grey market 12-month average sits at $740k.
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Collector Ownership History
Provenance notes for ref. 26586BC.OO.1240BC.01
Ultra-Thin Collector
RD#2 commissioned through a private introduction; held in a Swiss vault with three other AP references.
Price History
For ref. 26586BC.OO.1240BC.01 · this listing's recorded history
Jul 2026
$807,300
CrownDial internal comp
Jan 2026
$791,700
Chrono24 sold avg
Jul 2025
$776,100
Watchfinder price index
Jan 2025
$756,600
CrownDial internal comp
Aug 2024
$737,100
Chrono24 sold avg