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What an excellent discussion. 15 years later and I wander what the market has done. Did it follow the Poseidon’s designs or are they still in the rut of the standard regulators? It’s 2021 and I am asking many of the same questions the OP pondered. Off I go down the rabbit hole.

For the helpful ones, thank you for the guidance on the old USD tanks. I appreciate it.

Yeah, I thought 1976 would be considered vintage as well, but maybe not for these two old timers. However, you gave me reason to pause and go back and search the forum rules. I found absolutely nothing that would date the tanks as newer than vintage, so I'm standing by for an explanation for...

I have 2 USD Alum 80's that were made in June of 86. Are they the weak necked ones? Thanks!

Hi, I just bought an Atomics Cobalt 2 from the local dive shop. I want to pass my Cobalt 1 down to a family member but want to clear the dive log first. Is this possible? I cannot figure out how to do it. I've heard that there's a super secret way to accomplish this. Can someone please let...