Petz Masterbow viola, model … Masterbow "Dörfler" viola - best pernambuco, octagonal stick Item No. DA21A Manufacturer Dörfler Penzel Viola bow "No.3", … Masterbow "Dörfler" violabow - best pernambuco, octagonal stick × Masterbow "Dörfler" viola - best pernambuco, octagonal stick