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
WTS] Seiko 6M13-0019 Perpetual Calendar Age of Discovery : r/Watchexchange
Seiko 6M13 Millenial Perpetual Calendar - Age of Discovery Series - YouTube
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
ADVICE NEEDED: Frankenstein-ing a 6M13-0010 into a 6M13-7039 | WatchUSeek Watch Forums
Seiko - Age of Discovery - Perpetual Calendar 1992 Rare Collectors Item - Catawiki