Redial, fake or frankenwatch, I'm not enough of an expert to tell, but with those numerals that look like they were drawn by a pre-schooler, I'd walk away!
The dial, while heavily patinated, is likely original. As mentioned by the above poster, though, the re-lume job is awful. The case isn't signed, but still could be correct. The movement is certainly a genuine Longines.
Agree with Tony C. Dial, mov't correct, also uncertain about case. The examples Ive seen with this dial tend to be earlier serial number and different case. Like this: But there's one with serial not too far off in Goldberger book (p.90) that inside caseback looks quite similar, but with small differences in case- lugs, etc. This mov't has appeared in many artful recases. If I had to guess, Id hazard real. Pity about the lume.
Not a redial, fake or frankenwatch. Just a bad relume job. I highly recommend you set up an account and send an email to Longines directly. https://account.longines.com/en/contact#!/ They will give you the production history of the watch in a few days for free. Extremely helpful people there. An identical model went for stupid money in a Chrisite's auction a couple of years ago: http://en.bellesmontres.com/christies/longines-1754694_1291.php http://www.christies.com/lotfinder/...tractive-stainless-steel-5731471-details.aspx Why was this one so valuable? I haven't a clue. gatorcpa
For further reference, I own this (later) cal 12.68, and as you can see, the case is rather similar in style. That is, in part, what leads me to suspect that your case may be original.