Request to help identify a scubapro first stage (Regulator #2)

[gypsie king]

Hello fellow divers,

I have been given some regulators and I am trying to identify them. this one is with a G500 2nd stage. Can somebody identify which one ?

I am posting several regs, each in a different thread to not mix several pictures.

 

[Tanks A Lot]

This is a ScubaPro MK20 first stage with a ScubaPro G500 second stage.

 

[gypsie king]

Thanks for the help. It's always good to know what I have been given.