The upcoming Ingles & Hayday auction has 4 Sartory violin bows and one cello bow.
It seems that everywhere you go there are Sartorys - every major sale has a few.
The extraordinary prices they command are therefore not down to rarity, and as playing bows they often seem a bit uninteresting ...
The only theory I can come up with to explain their popularity is that people like saying the name, which seems to end in an "i" rather like Stradivari or Guarneri 