The Custom Aeolian Grand roll mentioned in Pat DeWitt's posting in MMD
210411 is intriguing. I Googled the name on the roll, Walter I. Pratt,
and found the following Wikipedia entry for the Pratt house in Iowa City:

https://en.wikipedia.org/wiki/A.W._Pratt_House 

It states that Walter I. Pratt built on an extension for a Kimball pipe
organ, removed in around 1966.

Greetings from the UK,
Rowland Lee