My favourite site for Cyps is w-frosch.de if you follow the links through to 'species' and then 'infragenic classification'
he shows a wide range of colour variants for both tibeticum and calcicolum(smithii), and has one picture directly
comparing the labellum of the two species. Decide for yourself!!
Yours does look the spitting image of Plate 114 in Phillip Cribb's book ( tibeticum!)
The other option is the forum at cypripedium.de
Either way I WANT YOUR PLANT!!!