Updated through online information from John Igoe.
In Bynum Petty's book, this organ is identified with opus number 130.
Identified through information from a handwritten list and an emended printed list of instruments, both in the Pilcher factory records now in the AOA. For more information see the document referenced below.
Handwritten list says Eastern (Possibly an organ built before coming to St. Louis?) Also Op. 1771