You have opened an old and dusty door, this thread was last posted to seven years ago!
My PO replaced the original clock and weather station with a "new" one sometime in the '80s, judging by the look of it. The clock doesn't work any more, either!
I bought a new-to-me original one by advertising in the want-ads here on Airforums.com It included the long "wire" with a weight on it, so that it would sink down low in the wall.
Double-sided tape holds the main assembly together according to the Service Manual. I just got around to finding some of that, so thanks for reminding me it's time to install it!