If so I may have some for sale.
I started diving in '86, then married and my wife got involved in '90. She passed her open water in '91 and on the weekend of our first dive together, August of '91 we found out she was with child. Gear was packed away and hasn't been touched since. Regulators have service tag still in place from the last service work done in '91. Cost like 46 bucks.
My son feels guilt for causing me to loose a dive partner and is now going to become certified. I will take the regs to the last place that serviced them and have them checked out. Some or all of this might come up for sale, the only for sure item we will be using is the Alum tank. It's shorter than a 70 but not sure the volume.
Anyway I will post it here and if it comes up for sale I will comment as such.
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Welcome back to diving. I hope you and your son make many new memories together. However, it is unlikely the gear you have would be of any vintage interest and aluminum tanks from that era are really just scrap metal. The regulators may still be useful to you.
Vintage, and this is simply my opinion but it is shared more or less with quite a few vintage equipment divers, is somewhat like the Muscle Car era auto collectors which pretty much came to an end with the EPA restrictions around 1972/73. No matter how nice a Honda Civic is or a Chevy Vega or a Pontiac Fiero, they are not a Muscle Car pre-73 and that 1973 year also corresponds roughly to the end of double hose regulator production by U.S. Divers. So, the point, no, your 1986 to 1990 SCUBA gear is not Vintage Era.
Good luck and welcome back!
James