Yeah, I know what you mean
.
I first looked at the 1436 vintage colorway, but the arms didn't match up as the RDJ arms are clear and the frame fronts had quite a definitive "3 segment" color, clearly separated out from clear lower to light grey transparent up to darker grey transparent...
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When I lightened the pictures, you can see the "striations" or random lighter sections dotted around in the frame front, particuarly in the upper half, especially on (his) right temple, just around the silver temple detail and above the right eye...
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...but granted, the lower section seems to have no tortoise pattern, but even when lightened, is light grey as opposed to clear.
I then thought about my Givenchy 7125's.
Mine, despite being exactly the same model, look like this...
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...despite RDJ's having only very minimal lighter tortoise or light amber sections, to the point, that in many shots, in fact they almost look black.
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This random "luck of the draw" with regards to the tortoise pattern and how much of the lighter and darker sections you may actually get, pointed me more towards the 1354/R8.
Mine are admittedly quite "stripey" in their tortoise pattern.
Maybe they are custom, as in using arms and frame fronts from different models, or an elusive vintage or limited model??
I'm more than happy to do some "Frankenstein's Monster" surgery on mine and "bolt on" the clear side arms with some unsuspecting different frame fronts......."
IT'S ALIVE!!".