Did you get it from H. Christiansen?
I have this flower in my head as P. superbiens. What are the differences?
Your plant is really a true Paphiopedilum curtisii. Some years ago the true Paph. superbiens was found again and this Shows the clear differences to curtisii. Her eat first two different clones of curtisii
View attachment 16835
Paphiopedilum curtisii
and now the true superbiens View attachment 16836 Paphiopedilum superbiens
Here an old print of the typical Paph. superbiens
View attachment 16837
Best greetings
Olaf