[radiodocs]

Since this is obviously not a "cloth-covered" cord, I don't what the responses you've gotten so far have to do with your post. If the rubber is not too stiff or cracked, why not just cut off the short section where the insulation is missing and reattach the cord to the clock? If the rubber is too far gone (doesn't appear to be from the photos) there are contemporary cord sets that would be a very close match. Perhaps the only difference would be a polarized plug molded to the cord.