And most of those will be pre 1900, on 7 inch USA Berliners, with a pressing limit of less than 1000 discs from each master, and a new master would require a completely new recording by either the original artist or another substitute artist. No wonder they are rare!

But here's a copy (the only known one!!) of a 'lost' disc, to show that they can turn up: https://www.45worlds.com/78rpm/record/nc690241us

This record appeared on ebay UK about 7 years ago, and I won it. After sending details about it to the UK Berliner expert, I was told that the discography of American Berliners did not have a picture of it, as it was only known from printed lists, and would I allow the image to be added in the next issue. Well, yes of course!