I visited Tokyo in December, and had some time to spend at Sunway in Nakano, as well as browsing the west side of Shinjuku, and the Ginza area (Lemon-sha, and some of the bigger brand shops). Was thoroughly enjoyable! Japanese culture tends to promote things being cared for, as well as on the retail side customer absolutely indubitably is king. So the watch condition tends to be good, and the service in shops is exceptional. Great selection of watches available, and especially in Nakano I think each store has to try and find their niche, so a lot of really good choice - one store upstairs had a superb collection of Nomos watches for sale, more or less every model which was totally unexpected for me.
Going back in a couple of months for a longer trip, so hope to spend a bit more time in those stores as well as out by Ueno area and some other places I have in mind. Will try to remember to write up - this might be a good thread to record good places to go.
(Only one purchase in Japan was a really nice 3572.50. I hadn't intended to buy anything, but I'd been looking for hesalite front / sapphire back, and with the older movement (yellow, rather than rhodium)). There did seem to be a huge number of Speedmaster reduced on sale - about 1:1 with the number of Speedies I saw. I wondered that with Japanese being on average a little smaller, perhaps the Reduced sold especially well there. But anyone after a Speedmaster Reduced, Tokyo at a time of good exchange rate (weak yen) might be a place to go.