These are rather different. The first one turns to release. You can see the 3 small indents is the edge and that the gold is a full circle.
The 2nd one is more like the standard incabloc one in that one end is open and the tips of the open end are just held under the lip of the open groove.
It is surprisingly difficult to keep wearing the same watch, isn’t it? I had been doing a week at a time early on, but now it seems I pick something different every day.
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