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Fantastic teacher, I think there is no doubt that it is that one.Today I learned that there were more than 10 brands of MK5 that look very similar to the Scubapro versions. Think I am done looking as my mind and eyes are starting to fade at the end of the day. Here is a version sold by Sea Elite that is the best match I have found so far.
So, maybe an early MKv that had an early thin yoke that was not rated for 300 psi so they replaced the yoke with a modern one. I have two, an early with thin yoke and later with thicker yoke. I have not dove the thin but may replace the yoke on it and try it.