I just broke out my last two NIB Mark Vs. Mine are a little bit newer, 80s, and are Tabata built Mark Vs. Parts interchange but the clones have nicer chrome and finish compared to my SP Mark Vs. One Mark V is sporting a set of very nice G250s and the other a nice Posedin Jetstream and a SP R190 secondary. IP locked up on both solid at 125 and 130 psi. I installed a cave seat in the one driving the G250s. Other than the cave seat, just because, and checking the IP, they are good to go.I have almost every metallic scuba item I've ever owned, going back to the 60s. I have my first 1969 SP MK5, worn and slightly dented, as well as the 'spare' MK5s I bought in the 70s, still new it their boxes, untouched in nearly a half-century,
James