Voit Trieste II regulator #01254 LP and HP
R22 and R22J Trieste (cataloged 1966-1970) Model contained a two stage, balanced mechanism. US Divers did not produce a comparable model. The R22J version contained an integral 300psi reserve unit. This could be added to the R22 version later (if so desired). Early production examples had only a HP auxiliary port, while later versions had both one LP and HP port. The Trieste was fitted with black hoses, “hourglass” mouthpiece (different lettering than grey version), and nylon hose clamps. Voit produced a version known as the Trieste II. It was mechanically identical to the Swimaster version. It came with a blue label, and curved mouthpiece. All versions had both box assemblies finished in shiny chrome. A clamp ring assembly was used to connect the top and bottom boxes.
This model was the same TRIESTE R22 regulator, with a reserve mechanism already coupled by the factory. The code for this regulator with reserve mechanism was V1-JR. The label contained, in addition to the inscriptions of R22, the letter “J” printed next to the word TRIESTE.
“Vintage Double Hose”. https://vintagedoublehose.com/voit-regulator/