I agree it has a lot of sanderiana in the parantage, just as the one in my avatar at the momment.
Mine is a very very very complex hybrid which then comes out to by almost 60% sanderiana when you work it out. Yours could be similar, a complex hybrid which has a lot of the sanderiana species feeding in to it. There are likely to be lots of those though and without a tag you are unlikely to ever know exactly what it is.
Vanda Eduardo Marcellini (sanderiana x Annette Jones) may be related to your plant. R.F. Orchids was selling a lot of these awhile back ... attached is photo of my plant.