Hard to tell from the "conveniently" fuzzy pic, but the left side of the stamped area is very low, indication sanding/grinding to remove the original numbers to allow the restamp. Note the different height of the 12127 where the second 2 is quite prominent and the other numbers far lower in relief...
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
- Douglas Adams
8R03S : 76A I 2A 15M 72 5 U
8R01S : 65A B 2A 28M 72 7 5 - Factory GT
8R01C : 65A M 2A 01E 72 2 W - CS/GT
8F01X : 65A I 2G 20E 24 1 U - EXP500 repli-bute
what are the differences, where should the primary wire enter the housing ?
what has been restamped ?
The primary wire should enter/exit closer to the vacuum advance. The one listed is way around the side from where it should be. The "C9ZF", the date code "9C13" and the letter "E" has all been added/stamped. The main error that Tim's referring to is the FoMoCo housing. It should be an Autolite housing. The lower portion of the housing was "conveniently" NOT shown either. It would normally have a "C80F" number cast on it (which you can't fake due to it being cast as raised numbers).
I noticed the auction ends VERY soon and, unfortunately, has one bidder. Fortunately(!!) the reserve hasn't been met. I sincerely hope this person knows what he's bidding on!