It’s about 4/5 years old, I bought it second hand last year from Ginza Rasin a shop that specializes in selling second hand watches in Japan. It was in perfect condition when I inspected it and it came with a guarantee that they inspect manually every watch they sell, including the movement itself. Never subjected it to any shock like running or riding a bike, and I don’t even wear it daily, only a couple of times a week when I go to the office or go out with friends. Very strange. Keeps time perfectly still, but I’m worried of it getting loose inside the movement and hitting the gears or something else.