My Spirit 013 has the 6R15B in it as well (bought it in Oct06). I've asked the question several times and gotten no response from anyone. I'm interested too in what they changed in their new 6R15 movements?
Difference Between 6R15A & 6R15B
Hi, recently received my Seiko Spirit SCVS003 in the post from Japan (23 Jan 2007). Having seen the pictures that Jurgen posted, I had to have one. All the other excellent photos and reviews were really helpful. Took me a while to track down a dependable vendor.
I emailed the query about the movement to Seiya Kobayashi of Seiyajapan.com and he explained that the 6R15B uses 6 different parts compared to the 6R15A. The 6 parts are all from the new 6R20 movement used in the Premier range. Seiko decided to do this to achieve economies of scale through mainstreaming the parts for the production of both watches.
There is no quality difference between the two movements, this is merely a cost cutting exercise.
The different parts are; the barrel and train wheel bridge, the movement barrel (complete), the centre wheel & pinion, the ratchet wheel, the oscillating weight and the ratchet wheel screw.
My watch has the later 6R15B, although Seiya's website photos show a 6R15A movement. I paid £138 for the watch, £9 duty and 13.50 to Parcelthief (or whatever they're called) for handling!!
Also, I had 3 extra links put in as my wrist is 8.5 inches. I took this precaution as so many people said that the bracelet can only fit 7.5 inch wrists at the largest. Upon receipt, I was surprised to find that I had to take all 3 links out! The bracelet fitted perfectly in the original size - don't know what happened there. Shame, coz Seiko charged £14 for supplying the 3 links!
Best Wishes
Gary