Almost nothing is known about this JDM watch, it cannot even be found in any of the likely catalogues when looking at the serial number! (And VintageseikoNL has almost all of them!) Truly a mystery watch then that must have been produced for a very short time indeed. Fortunately a manual is available here. This is a serious watch with all the time dedicated functions you have and have not imagined. Leap year, anyone?
This watch comes with a new solid leather strap, but not this one (which has been custom made and is too short for most).
The gist of the operational time functions is summed up below:
The Seiko World Timer Alarm Quartz Watch Cal. 6M15 is an analogue watch featuring calendar, world time, alarm and stopwatch functions.
Hour, minute and second hands and a small 24-hour hand.
Date is displayed in numerals and month is indicated by the hour and minute hands. The second hand indicates the number of years that have passed since the last leap year. The calendar automatically adjusts for odd and even months including February of leap years up to 2099.
■ WORLD TIME
The time of 22 time zones throughout the world is displayed. Daylight saving time (summer time) and standard time of those time zones can also be displayed as required
simply by turning the crown.
• Time transfer a convenient way of using the WORLD TIME mode
The time displayed in the TIME mode can easily be replaced with that of any time zone in the WORLD TIME mode. This function is very useful when you travel abroad. The time of the city you visit can be shown on the watch without resetting the hands.
The alarm can be set to ring on the basis of the time of a desired time zone. It can be set on a 24-hour basis in minutes and rings once a day.
The stopwatch can measure up to 23 hours, 59 minutes and 59 seconds. It measures in 1/10 second increments for the first hour, and in second increments thereafter. Split time measurement is possible.
■ BATTERY LIFE INDICATOR
The second hand moves at two-second intervals when the battery needs to be replaced.