BCD were pretty standard back then, Mostly horse collar style with oral inflators. By the late seventies, Jacket style BCD with power inflators were widely available. I bought my Seatec in 1982. The choice to not put Ms Bisset in a wetsuit or BCD was purely an artistic choice by the film makers. The tank was at the time the cutting edge of technology, AL 80.
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The Gear she is using is still quite servicable today. As has been pointed out in many threads a capillary depth gauge on the spg and a watch would be plenty of gear to dive with back then with the wreck laying a maximum depth of 85 ft. Most divers assume that you need a lot of gear to dive, but regulators and the basic gear has remained little changed since 1978. More safety gear has been added, octopuses, dive computers and more sofisticated BCDs, but the basics of diving stay the same.