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 - Age of Discovery-Perpetual Calendar - 6M13-0019 - Men - 1990-1999 - Catawiki
GENUINE WHITE DIAL SEIKO AGE OF DISCOVERY 6M13-7010 | eBay
Seiko] 6M13 "Age of Discovery" Perpetual Calendar : r/Watches
Seiko - 6M13-0010 - Age Of Discovery - Perpetual Calendar - ( Fully Serviced ) - Men - 1991 - Catawiki