well got to pop off-line for a few hours but will leave a ponder to come back too )
on vintage and now some modern Seiko dial you seem " SQ " I always quote it as Seiko quartz on my listing and post now I see some one saying it stands for special quartz can't see from a quick search any thing to prove this , but then again the Seiko quartz is almost the same lots of refs to it in sales but not a lot more so which is it members.
special quartz ( I'm special me )
or
seiko quartz ( wake me when it gets here )
or shall we make up our own lets see them
as it always is ismy