Phragmipedium Cardinale 'Birchwood' AM/AOS

Son Edward won this plant at our society's annual Christmas dinner.  Its tag identified it as Phragmipedium schlimii 'Birchwood', which it clearly is not.  We've identified it tentatively as Phragmipedium Cardinale 'Birchwood' but if anyone knows better we would be happy to be corrected.  Phragmipedium Cardinale is a hybrid of Phrag. schlimii and Phrag. Sedenii, but we've discovered that the hybrids in this group all look very similar and that has made us unsure of the correct id.  Unlike some of the Phrags, it is a relatively small plant and we are growing it on a bathroom windowsill with some Paphiopedilums.