The clamps just hold the movement to the spacer ring. This spacer ring actually just doesn't do anything since it doesn't reach anything by itself. It requires the rubber bumpers to hold the movement/spacer ring combination between the sides of the case. The spring ring is then required to hold this combination towards the crystal when you close the back. This floating design seemed like a nice idea, but over time the rubbers got deteriorated and the ring often got lost with no service replacement available.
It's because it doesn't have the rubber bumpers to "float" the movement, but it would become obvious when something is missing, unlike the other watch. I also like the 176.007. Any pictures?
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