In enlarged Ridges case of 1869. Some stops retained for use in Aeolian-Skinner of 1948, and in subsequent enlargement/rebuilds.
Updated through on-line information from John W. Decker, Cleveland, OH. -- I have the Concert Flute and Unda Maris that were not used in the Skinner re-build (Austin Opus #573). It was offered in the Diapason Magazine in the 1990s. I saw it and bought it for $500. It was a direct purchase from Brigham Young Univ. and the bottom C is stamped Opus #573. They said it was not used in the Skinner Rebuild. It's a home hybrid organ and the twin set is gorgeous.
Altered in 1925, 1937, and 1940 by Austin. Moved to The Joseph Smith Auditorium at Brigham Young University, Provo, UT ca. 1948. Later broken up for parts.
Information identifying this instrument from the Austin Organs, Inc. web site, accessed December 31, 2004: http://www.austinorgans.com/organ-research.htm.