Opera Singers - Lot of 62 Photographs

Lot of 62 vintage unsigned photographs from different opera houses including Bayreuth, Vienna, Munich, and others depicting mostly opera singers including Edouard Kriff, Jan Kiepura, Viorica Cortez, Maria Cebotari, Beniamino Gigli; and few photos from scene productions, most are in black and white and some few colorized, some are stamped on verso by photographers.  Various sizes ranging from 3.3 x 5.4 to 3.9 x 5.7 inches, in very good condition or better.