What Regulator is this?

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Very interesting, I have seen the first associated with Seapro and was told that was what it was....is it possible Seapro had a deal with Submarex...or vise versa?

Yes very interesting indeed, one of the more rare regulators I would say, certainly I have never seen one before and I have been in this industry since the mid 70's.

It could be there was an association of sorts, I wouldn't know for sure, but Submarex in my experience was more known for its instrument line and I have seen a few of their depth gauges in use before in Europe, but this is the first reg I have ever seen of theirs, seems it wasn't too popular either