The "Pierce Piano Atlas" 10th Ed. says that Marshall & Wendell Piano
107414 was built in late 1925. The year 1926 started with 107500, so
107615 would have been built then. The year 1927 started with 109700.

The introduction states: "Marshall & Wendell Piano Co., First address
was Albany, New York 1836 then to Central & Water in Rochester, NY.
Became a Division of Aeolian-American Corp.  Originally Marshall & 
James Trever."

Jack M. Conway, Los Angeles, California, USA