Frank - Geez, I love a good mystery! Thanks so much for the link to the discussion on this mark. Great reading!
I noticed on each of the marks I looked at (some links were no longer working, darn it), were slightly different. The PK remains basically the same, but there are differences in each. Particularly the black vase with the straight line beginning at the end of the P and ended at the lower leg of the K. The backwards F is clear to see too. Whereas on mine, it look much less like an F and more like a T. (Reminds me of the different Hummel bee marks that point to the period they were made.) There's clues to the maker in the slight differences of the mark, I'll bet.
Maybe I should throw my vase in that other post so others can find my mark too?
Relieved my instincts weren't wrong - it's not a Pairpoint reproduction- whew!