I’ve been going through releases with a date earlier than their format was released and noticed several tagged “Flexi-Disc” from the 1930s, e.g. Release “Jalousie / Ty Y Yo” by Tanzorchester Géza Komor, Tangokapelle Morello - MusicBrainz
MusicBrainz claims Flexi-Discs did not come out until 1962.
The problem is that these records are not shellac, thick vinyl, or thin flexible vinyl. I believe the discs are Celluose, since a record from a similar timeframe on Discogs matches the image from the Tangible Media Collection.
There’s not a ton of information on these records, but this personal webpage claims they were made around 1927-1933 for Austria and Sweden under the labels “Tri-Ergon”, “Colorit”, “Photo-Electro Bellaphon”, and “Star”.
I don’t see a clear medium for these to go in, should they go in “Other” or “Flexi-Disc”, and if Flexi-Disc should the date of introduction be changed?