While not as far back as you asked, it's close. 30 years ago this month I certified NAUI. It was a college course so we were in the class room and pool lots. The old saying was you could get any color gear you wanted as long as it was black. We had the Mae West BC, oral inflate only. No octo but practice lots of buddy breathing skills. Then we did tables, tables, and more tables. Navy dive tables instead of rec tables of today. My instructor was a task master and we did lots of pool then the open water in Puget Sound, very cold!!!! My instructor talked all the time about how PADI was going to be the end of the scuba industry and how it sucked. I had other friends that did NAUI that got less training than now and got their cards. I was 17 and would have done what ever it took to get certified. Good times.