Hi Don, I think I have an original 122 with a blank bottom. I compared it with other 122's in my house and the bottom shape appears correct. However, when I compare it to a fxo blank bottom, it doesn't have the tell-tale mold split line running down the center of the aluminum section.
I can't be certain if it's original, or carefully altered. My guess is that it is original!!
Hope this helps!!
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