Well fellow members I bought a tat lot of old quartz Seiko ..wanted a Seiko sq bracelet that was on one of the watches so any way I took a look and have clean them all up a couple might need new crystal but got to see if I can get them working first ..hence this thread as wonder on battery's needed for them as they had no battery in them so could not swap like for like.

First is a Seiko quartz sq 100.. 8123-6150...

now this model and another one well to be honest all four I had (3 Seiko one citizen) does not seem to have the bar's for holding the battery in place but looking at them this seems like the design ... I got the citizen working but it stops and starts so got to look closer on this as could be the battery needs to be a different size ag4 used but maybe ag1 might work better)
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Any way back to the sq well what battery does it take do you know ?

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As always Ismy

p.s might keep thread for all four of them and maybe others I need help with