Here's a set Richard Bryne has in the
Speedplay pedal museum. He dates them to 1980. From that entry:
Produced by Bill Grove, a pioneer BMX mechanic and designer. Grove's business, Titron BMX, made parts such as pedals, axles, seat post clamps and headset locks. Grove went on to head design for Hutch BMX and his pedals eventually became branded with the Hutch name. As BMX matured, Bill Grove's early designs have garnered something of a cult status among collectors and his BMX pedals and other parts are now both exceptionally rare and valuable. If you can find a pair of these "Holy Grail" BMX pedals now, the going rate is over $1000 a pair.