Thank you for posting about a non-regulator item. I believe Ovalis is right in identifying the fins as Web Feet. There appear to have been two versions of such fins, the Healthways model and the Walter model. They are not completely identical in appearance: look at the way the radiating ribs on the blades meet on the top of the foot pocket in the case of the Healthways, while they converge at the front of the foot pocket in the case of the Walter.
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