Vintage Question: Any Idea What This Thing Is?

[shoalsgary]

GSD S300 is still my favorite regulator.

GSD, what memories that brings. My favorite mask of all times was a GSD Esmeralda. And who can forget their Spinnaker regulator, made famous by Nick Nolte in The Deep.

---------- Post added July 1st, 2013 at 05:36 PM ----------

I recall literature I had in the eighties when I bought my GSD regulator which touted their use in a world record dive. My GSD is the easiest breathing regulator I have ever used. I still use it, thirty years later.

GSD are the founders Gatti,Stradella,and Danielle in the 1970and 80's. att are a reg foto's View attachment 124140View attachment 124142View attachment 124143