So I'm the happy winner!
The reg is in perfect condition, with a West Warner Avenue brass plate with the Serial
n°237056. The box is entire made of brass except the yoke and screw who was made of zinc(?). The hookah port is non functional as well.
The yoke have the later screw with marks on both sides Aqua-Lung & US Divers. There is a sign "mu" stamps on the base on the yoke. There is another "M" sign, that I've never seen before, on the back body just under the yoke parts. The filter, also made of brass, appear to have been replace and never been used on the water.
Hose is in perfect condition, just a little bit dusty. The mouthpiece is the later one, 1968-1972 period. On the vinyl hose clamps, all the screws -- except one who was probably replace -- was made of brass.
If you have more informations about this reg, please let me know. I wonder myself if I will open the reg to find more information but I'm afraid to scratch the paint or worst! Firstly I will open the mouthpiece and verified and cleaned the valves and cleaned the hose clamp.
All my grateful to Mark Howell for these amazing knowledges and publications and all my thanks to everybody on this forum and especially the moderators who have help me to have a better comprehension of the double hoses regulators! 