Wow! The Premier 6R15 (SPB007J and 009J in the picture below) sells for AUD1300 in Australia (roughly 183,000 Yen). It has got to be the most expensive 6R15 watch so far.
Price may not be the same in each country but I think this serves as a rough indication.
Last I check, they are not yet available in Singapore. I believe the price will be lower here.
Meanwhile, the new Japan market 6R15 watches in the Mechanical line will be released on 25th October according to the link below.