The watch clearly isn't a 176.001, and I assume that it isn't even a 'transitional' 176.001/176.007 (or your case-back would have a stricken-through 176.001 followed by the 176.007). This being the case (no pun intended), your watch is otherwise a normal (if early) 176.007, at which point in time in Omega history cal.1040 movement itself should have been all sorted out. On this rationale, it's unclear why either the watch in general or even the movement itself would be a "prototype."
That being said, there seem to be some remaining possibilities:
(1) Even thought Omega had already settled on the 176.007 watch generally, at some point Omega made some "prototype" changes to the movement only (thereby resulting in a watch that is otherwise 'typical,' but with a 'prototype' movement)
(2) Your otherwise typical (if early) 176.007 has a movement that is otherwise typical but that at some point had the rotor replaced (with such replacement rotor sourced from either a movement that itself was a 'prototype' or instead from a lone 'prototype' rotor of some sort)
(3) Some mix-up in Omega caused someone to mis-number/stamp an otherwise typical rotor/movement
The possibilities above, if resolvable, may be best addressed by a watch maker with experience with cal.1040's, to give the movement/rotor a jaundiced eye for either (A) something about the rotor that is atypical, or (B) something about the entire movement that is atypical.
@Archer ?
Regardless, it's a great looking, early .007 with - at worst - an 'interesting' story/question about the rotor numbering.
[EDIT: Clearly, when I reference "Omega" making changes to the rotor/movement, this relates back to Lemania]
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