Identifying old Oceanic BP first stage

[scubaalblake]

I have an old Oceanic Balanced Piston first stage.
There seems to have been a change in 1995 (service kits are different)
Can anyone tell me what changed? How can I tell the difference between a '1995' and a 'pre-1995'?
Wanna make sure I source the right kit.​

 

[runsongas]

if it has the ambient chamber holes in the middle section like a mk5, it is pre 1995. the 1995 changed to have it moved to the top section like the mk10.

pre 1995

1995

 

[scubaalblake]

Brilliant. Its a pre-1995 (like the Mk5). thanks a lot.

 

[Couv]

Interesting. I wonder if the pistons (like the MK5 & 10) are different.