Thanks, probably will drop by when I have the chance to do so
I've seen the SDGM003 in person when I was in seiko boutique in JP last 2 month, very nice finish on casing/bracelet. It was running on 6R15 and I already have another one with same movement therefore didn't buy it, but a bit regret though as the price is actually lower compare from buying online, it could make a nice gift for my dad...
SDGM001 I think is about the same as SDGM003 but different dial color, SDGM005/SDGM007 is a 500 limited pcs azabu tailor model, same 6R15 movement. SDGM005 can still probably found used in the jp market but SDGM007 is difficult to find now, I've been trying to find one for quite some time already.
That's all I know for the sdgm brightz model, hope all these info useful to you.