Wikidata: https://www.wikidata.org/wiki/Q30162558
Inventor: https://musicbrainz.org/artist/3655cfea-6039-4cd8-b2ab-3fd186fcf736
Grove claims it's "a precursor of the French harmonium": http://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-0000021982
Probably a type of https://musicbrainz.org/instrument/20443ce3-cde1-4968-b7cc-65e45bb9714f ?
Disambiguation: free reed keyboard instrument invented by Cavaillé-Coll
Description: free reed keyboard instrument invented by Cavaillé-Coll in 1830 and used in French works during the mid 19th century. Precursor to the harmonium.

Looks like https://www.europeana.eu/portal/en/record/09102/_CM_0158390.html but sadly we can't use that image.
Example: https://www.youtube.com/watch?v=MVHkqQ2kPrU
Played on https://musicbrainz.org/recording/cb936512-21d0-4209-97d8-2ae4a503d1ea