I have a question about the SEIKO prospex"Save the Ocean"..version. On the Internet, I found out that there are many versions for this edition so I would like to ask about the differences..From I know that, SBDY021 has 2 languages for the day and the made in Japan engraved on the watch while other versions don't have.. I also know that J model is also made in Japan so does SBDY021. Where is there a price difference between 2 since both re made in Japan??