I'll open mine tomorrow and see if it's a prototype, too ;-)
Are you very sure, by the way, that the dial without the applied indices (the matte blue dial with the black hour register) is the earlier variant? I ask, because I have an early example with the sunburst blue & white hour register dial, and when I sent it in to Bienne a couple of years ago, they swapped it for a service dial that looks exactly like yours (minus the twin T's, obviously). I'm currently considering putting back my original, somewhat dinged, dial.
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