Need help identifying old Oceanic 1st stage

[spoolin01]

I started digging through bins of old regulators and parts today, a corner of the sisyphean plight not recently visited.

Among many I could eventually identify, I found a couple of old Oceanic regs that have stumped me. Both look the same, aside from one being a Nitrox version with Delta 2nd. They have one HP with 4 LP ports. I think these predate the SP4.

Can anyone ID it?

 

[axxel57]

It's an SP4...............

 

[spoolin01]

It doesn't look like the SP4 pics from the service manual, or from other sources. Were there two versions?

 

[axxel57]

Excuse me, my mistake, it's of cause the SPORT Piston First Stage of Oceanic, not the SP4.