I have a Mido ocean star dataday made in 1970, it looks pretty similar to the new commander series. When i had the watch service by a local watch maker, the watch was running well and didn't have any problems. Since last year I don't really know how it happen, but the crown fell off and I haven't been able to find one locally. I was wondering if there is a fellow rolex member in the other part of the world, maybe switzerland can find me one. the case number is 6624289.