These are New Balance M2002RX sneakers. The color scheme is gray with navy (or perhaps blue). There is a stain on the toe of the shoe, as seen in the fourth photo, but the entire sneaker has been given an aging treatment, so the vintage-like atmosphere makes it not very noticeable, and I've worn them without much concern. (It might come off if you brush it with a suede brush.) I've worn them about three times, and I remember the purchase price being around 20,000 yen.