Too bad it shot past my self imposed limit of £150 + S&H. All things considered the price it eventually went for wasn't so bad but too much for me atm.
To be honest, I already have one 51 with a factory original 1.1-1.2 mm stub (juicy but would like it to be more crisp). It was just that that nib was... so achingly clean and shaped so nicely. I can almost see it leaving behind a beautiful wide, wet but crisp line with amazing line variation. Oh well, the hunt is still on, just lovely to see an outstanding specimen like that.