Lowii is a species that has a tremendous amount of variation within it. Some people would probably try to assign varietal or species names to some of the variants, but generally they are considered one species.
This particular Paph looks like lowii to me, though not a variant that is common in culture.
Can you give more details? Is the color true? Plant size? No. of flrs on stem? Have you seen any others from same source? Can you supply true origin, or if from seed, photos of parents or maybe the name of originator?
All those hairs at the base of the petals, along with the spotting, reminds me of glaucophyllum/liemianum/etc. Could it be a hybrid between lowii and one of those? I'm sure I've seen this plant before...your flower looks really familiar.
Matt's right, P. lowii covers a very wide geographical range, and in it are many different types. I for one believe more identifiably different species will come from this variable group. If you look in my paph book you will see many of the types. Don't forget, just recently we have split P. richardianum and P lynniae from P. lowii; you should see some of the others I've seen....perhaps Olaf and others have, too.
Your plants appear to me to be the outcome of two of those types crossed with each other; they are very close but have quite different dorsal sepals and manner of spotting on the petal bases. If you are ever able to find more location/habitat data, I'd be interested in knowing it.
Incidentally, are ALL the stems smooth, fuzzy, or different? How would you describe them? And, how tall are they?
Very nice flower. I think what you have is the hybrid P. Toni Semple = lowii x haynaldianum. I have one and have seen many recently. The colour throughout the flower resembles them greatly. The spotting from haynaldianum disappears in many of the good coloured TS's. It is virtually impossible to tell P. TS plants from either parent. To me, the colouration of the dorsal and petal ends particularly. They are totally distinct in this flower and many other P. TS's. Flower variations in respect to colour are to be expected but yours, as in mine are stronger and relate directly to the quality of the parents used. I have also seen in the past few years many P.TS's sold as P.lowii. Its hard to mimic haynaldianum with the spots but some recently have tried. It is very difficult also to tell all three plants from each other.