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Thanks for the information. I was thinking it was some variation of an Ocean Divers regulator.That first stage looks like it's the RG-1002 from AroPec.
I believe ProMate does not manufacture themselves. What they have on offer looks very much like what several Taiwanese OEMs offer, AquaTec, Ocean Divers Supply , Aropec and Tilos among them. I can never distinguish who makes what with these, but I believe Ocean Divers Supply is the main manufacturer.
Some of ProMates regulators still bear the AquaTec logos.
You can look at the RG-1002 Ice schematics and simply ignore the environmental seal parts.