I have a working Heathkit GC-1000 Most Accurate Clock for sale. It is in very good to excellent condition. It receives the signal from WWV on 5, 10, and 15MHz. It decodes the time data embedded in the WWV signal and displays the time. These have been very popular since the 80's. It is unmodified except for the blue "HI SPEC" LED. Heathkit says that when the HI SPEC LED is on the clock is within 20 milliseconds of the true time. No issues or problems. I am the second owner from new. $225 shipped to any US address. You can contact me at email@example.com. Doug W4DAS Note: the face of the clock is black. It is hard to get a good photo exposure. There was a fairly bright light shining at the clock to get a decent photo. It looks much better in normal light.