[7s26b]

To add a little, not all 7S discs line up the same, the 7S "C" spec discs are aligned slightly differently - so the numbers sit lower . You can see the difference in the pics - 7S/C at the bottom. Pictures from http://members.iinet.net.au/~fotoplot/seiko7005/s7005.html and http://q-m.org/2012/11/10/seiko-watch-movement-part-3/

 

[7s26b]

Could I use a 7009 movement to replace a 7002? I understand the 7009 is the same as a 7002 but has day/date instead of just date.

Is 7009 crown at 4 or 3:18?

Ivorbiggin has already answered this
http://www.thewatchsite.com/34-watc...94-7002-7s26-date-wheel-query.html#post977866

 

[7s26b]

I have a 7002 date wheel on a 4r35 movement. It changes over fine with the time, but the quickset doesn't always work right. I'm confident it could, I just haven't gotten around to taking the whole thing back apart to fiddle with it.

So what you're saying is - it will work, but not reliably?
I think it was shown in an earlier post with pictures, that the mechanism isn't really compatible, mechanically or materially - as you now have spring/stainless steel wearing against an alloy disc, as opposed to plastic against metal.
http://www.thewatchsite.com/21-japa...890-help-me-understand-skx171.html#post775730