We had the clock upgraded to a quartz movement and the clock guy did not think that they were that unusual as he has done several. On the Burb mounting the flat spot is turned 180 degrees so that it mounts to the roof instead of the console as they were designed for. When it is in place it looks completely factory as the wiring is tucked into the windshield header.
As for value, I think the Camaro guys would value it the most, so you may want to check that out. I believe that you are still able to get the clocks from Classics Industries, PN 39801116 as a reproduction.
Jim
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