Glossy 2.75 x 3.75 photo of the composer and conductor posing together, affixed to a slightly larger mount, which is in turn affixed to a 5.5 x 7 mount, signed in fountain pen on the second mount by Mengelberg and Schreker and dated on the reverse of the mount, in an unknown hand, October 17, 1923. Consignor indicates that the photo was taken in Amsterdam (Mengelberg’s home town). Schreker was in Amsterdam in order to conduct the first half of a concert dedicated to his works; Mengelberg conducted the second half. In fine condition, with a bit of light foxing to smaller mount, and some mild rippling to larger mount. An uncommon portrait of two of Europe’s most respected musical figures. RR Auction COA.