The prepared-for stops were added as Op. 623-A in 1927.
Identified through information adapted from E. M. Skinner/Aeolian-Skinner Opus List, by Sand Lawn and Allen Kinzey (Organ Historical Society, 1997), and included here through the kind permission of Sand Lawn:
Replaced 1912 two manual M. P. Möller, #1412; additions in 1927.
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