Seiko 0634-5019

[charger105]

Hi All.
I have a Seiko 0634-5019 LCD from 1976. It's a pretty cool watch. See here for an example:

http://www.retro-watches.co.uk/watches/ ... D07145.htm

Anyway, it has time, stopwatch and date display, but not month. How does this work ? Are you supposed to adjust the date at the beginning of each month (except when the preceeding month happens to have 31 days) ? Seems a bit weird !

Rgds,
Andrew.

[rewolf]

... Are you supposed to adjust the date at the beginning of each month (except when the preceeding month happens to have 31 days) ? Seems a bit weird !

The GP has the same "feature": no month, adjust if less than 31 days.
Perhaps they wanted to mimic the behaviour of analog watches to make swithching over to digital easier for users

[charger105]

OK. Makes sense that it's a hangover from analogue watch technology.

I've only just realised......I've never actually owned an analogue watch!
I guess you'd have to adjust the date at the beginning of each month on one of these.

Tks,
Andrew.

[retroleds]

Perhaps they wanted to mimic the behaviour of analog watches to make swithching over to digital easier for users

And it saved a lot on programming and circuitry, the cost of which would be irrelevent within another year or two but deathly expensive in the early years. I'm always amused by the ones where putting the month in is part of the setting sequence, but only the day shows during viewing/command times....nice that they at least keep track of the months and roll into the next month correctly(leap years excepting).

[rewolf]

Perhaps they wanted to mimic the behaviour of analog watches to make swithching over to digital easier for users

And it saved a lot on programming and circuitry, the cost of which would be irrelevent within another year or two but deathly expensive in the early years.

Yep, saving a few transistors was quite probably the only reason, but as people still were used to analogue behaviour it was deemed acceptable behaviour. Innacceptable today.