To my eye it looks like 2 identical pouches on each end of belt. I dont think one ever carries two whistles.
The split & sprung look I agree is unusual. Cant fathom what it would be for myself.
Appears to be for tubular containers with possible front projection lower down? carried 2 at a time....
Internal dimesions of the "holsters" would help add to the equation perhaps?
Spiral
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