Seiko] 6M13 "Age of Discovery" Perpetual Calendar : r/Watches
Fully Work [MINT] SEIKO Presage Perpetual Calendar 6M13-7000 Men Watch Japan | eBay
WTS] Rare NOS Seiko 6M13-0010; 1991 "Age of Discovery" : r/Watchexchange
ADVICE NEEDED: Frankenstein-ing a 6M13-0010 into a 6M13-7039 | The Watch Site
Seiko] 6M13 "Age of Discovery" Perpetual Calendar : r/Watches
6M13-0010] My unworn and immaculate condition "Age of Discovery". A perpetual calendar that keeps track of Day, Date, Month and Year until 2400! : r/Seiko
Seiko 6M13-0019 Age of Discovery Perpetual Calendar quartz watch Extremely rare | eBay
SEIKO 6M13-0019 Age of Discovery Perpetual Calendar Watch | Flickr
[WTS] Seiko 6M13-0010 Perpetual Calendar Age of Discovery | WatchCharts Marketplace
SEIKO 6M13-0019 Age of Discovery Perpetual Calendar Watch | Flickr
FS: [NOS] 6M13-0010 Seiko Age of Discovery | WatchUSeek Watch Forums