Salzburg Festival - Lot of 6 Signed Opera Photos

Signed lot of 6 black and white photos of various artists shown in role at the Salzburg Festival, undated but clearly from the 1960's. Includes 1 photo of James King in Iphgenie in Aulis, 2 of Leontyne Price (probably in Il Trovatore), 2 of Grace Bumbry in Macbeth (1 of which also features Dietrich Fischer-Dieskau in the title role), and 1 of Helga Pilarczyk in an unidentified opera.  Stamped on verso by photographer Dan Ellinger, Salzburg. Size of each is 4 x 5.75 inches, in excellent condition. Sold only as lot.