Hey all! I just got this on ebay last Friday. You recall the untimely death of my old Radarange a few weeks ago... and I have been reheating leftovers in a vintage electric skillet until I could find another Radarange. This is a model RR-4D and it was built Feb. 1974 but not sold until Jan 1975. When you see the original cancelled check,you can understand why Radaranges did not sell very fast at first. $$$