Secondary / used
Asking $770–$860
Suggested buy ~$720 · sell ~$820
full set · single_source
Used asking prices sit close to or above new retail ($650-885) -- consistent with this being a special edition that Seiko holds value well on, not a data anomaly.
Sources: Chrono24 UK listings (£606, £648, £675, converted ~$770-860 at typical rates) and one US Chrono24 listing at $850. All from the same platform (Chrono24), no independent eBay sold-comp data found -- held to single_source rather than cross_verified for that reason.