Yet another gloriously grown plant from Dr. Chiew - and again a sanderianum hybrid with lovely rounded petals (i.e. without the "shoulders", the angular bend, that I tend to detest in sanderianum and sanderianum crosses - and, yes, I know, this might say more about a personal idiosyncracy of mine than about the quality of the flowers!)!
Lady Isobel x sanderianum is Booth's Sand Lady, so either the first "x" should be "=", or it's a sibling cross.
My guess would be, that the grower wanted it acknowleged that one of the four "grand parents" of the plant was an awarded clone.I agree with Ray, that this is done clumsily on the nametag. As I am not the most hybrightest person, maybe we could have someone with a little more expertise confirm or falsify, whether the following would be a more appropriate designation: P. Booth's Sand Lady x P. Booth's Sand Lady (P. Lady Isabel x P. sanderianum 'Pull Bridge' BM/01OF)?
What the '01OF'-bit stands for, might be anybody's guess. Though, I have some difficulty in accepting the interpretation that it derives form IOGA. Such a misrepresentation seems to me to require a game of at least interplanetary telephoning to occur!
Another guess might be, that the 01 refers to the year (i.e. 2001) when the Bronze Medal was awarded. OF might stand for a local branch of either The Orchid Society of Japan or The Paphiopedilum Society of Japan f.ex.The Orchidsociety of Fujisawa (OF) , cf. the side of the tag with information on the grower/nursery from whence the plant was acquired?
But, as previously started, anyone's guess might be as good - and most likely better - than mine!
Kind regards, Jens