The 90s vader tie fighter was a very different mold from the original vintage.
Potf 90's: http://www.rebelscum.com/potf2dvtiefighter.asp
There might have been a later version that used the original mold but I don't study up on the newer lines. It isn't uncommon for some vehicles to have different coo markings though. Search for the Potb thread here and see if it has some pics of the various vintage ones.
Edit* here is the Potb thread. http://www.imperialgunneryforum.com/t4137-potb-project-outside-the-box-your-one-stop-place-for-star-wars-vehicles-playsets-rigs-creatures-etc?highlight=Potb
If there aren't pics you might be able to pm Marco, or Aussiejames is another who might be able to help. Look also in the limelights and see if someone has a vader tie focus that may have good pics.
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