Akimbo,
The AMF Voit Viking A66 fin was much different from the quite similar fin, the Viking A6 which Lloyd Bridges (aka "Mike Nelson") used in
Sea Hunt. The blade was much longer, and it had the potential for being a heel strap fin by simply cutting along the dotted line to remove the heel. Here's a photo I took of this fin after being modified to my scoop fin design:
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Here is a photo of my diving fin collection:
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The Duck Feet are in the left inner circle, and include two pair of full-foot and two pair of open heel design Duck Feet. I also have an AMF Voit Viking A66 in black at the bottom of the inner circle. In the center is the Aqueon, and at the top is a training monofin used in competitive finswimming. The others are pretty obvious, except perhaps in the outer circle on the right there is a set of White Stag Super Stag fins, a natural rubber open heel fin with a non-vented blade. This fin is actually a great fin, and there are several examples of fins I've modified to the "scoop fin" design.
SeaRat