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The one I just bought has the big triangular shaped 2nd with the solid cover. I have another one like that that I used a few years but the one I currently use is a newer smaller version. Maybe only 20 years old??? time passes so fast.
I still have, and sometimes dive, my Sherwood Magnum Blizzard regulator. I understand it was a go-to regulator for the Antarctic diving for quite a while. I don’t think this regulator will ever “wear out.”