Thank you for all the comments - I asked a couple of straightforward questions of the owner ahead of receiving the forums input and it disappeared from sale very quickly. Maybe just a coincidence.
In answer to Michael's query, the ref number came from the owners description but the double small ticks at "6" were what I wasn't sure about, though Vahalis's workbook reference seems to clear that up and the incorrect ref number I was using.
Its a shame it "disappeared" as I quite fancied it for my wife.
As always - the IWC forum "rules" (as my kids would say) with its advice!
Regards
Richard