I have this weird looking watch in my possession. Obviously I had a look on the net, but found nothing similar. This thing is fat, about 15mm in height and 47mm in diameter. At the moment it isn´t working and the crown can be pulled out with ease after unscrewing it.
The weirdest thing about it for me is, there is a screw in the case back which, when unscrewed, doesn´t produce anything, I don´t know what it´s there for.
It seems that the whole watch can be lifted out of the bottom part of the case, though beat me to death, I don´t know how! The bezel doesn´t turn either, but there is a gap between the bottom part of the case and the glass an bezel part, which makes it look like the top part slips into the bottom part.