Vintage Seiko Nextime EK712M 4-Person Biorhythm/Clock/Alarm/Calendar; Rare!

Description

Seiko Nextime EK712M 4-Person Biorhythm/Clock/Alarm/Calendar!  Very rare!
Here is something very rare Nextime 4-person electronic biorhythm calendar!
Functions:  time, alarm, calendar, and four-person biorhythm.  Allows you to track and display up to four biorhythms of those with different birthdays/years.  Could come in handy to predict when the wife will become insolent or ill-tempered, or when not to ask the boss for a raise!
Made in Japan.  Was not a USA-imported product and, upon information and belief, was sold only in Japan in the early 1980s, with very limited distribution.  This product was not well-understood at the time and did not sell well.  As a result, there were few made.  This is likely the only one in the United States.
This four-person biorhythm clock/ alarm/ calendar. It has been lovingly stored in a temperature and humidity-controlled, smoke-free environment for three decades.
The photos accurately depict the appearance and condition of the item.
You'll get only what you see.
48 Continental States ONLY.  Shipping to AK, HI and Canada will be more and added to PayPal invoice.
International bidders ask for shipping before bid.