[78-L] Signed-in-wax recordings post-Berliner (such as Mary Garden on Columbia A 1190) query.

[Royal Pemberton]

I found a fairly nice copy of A 1190 at the local Salvation Army yesterday.
One of the things that moved me to buy it was seeing that Mary Garden had
autographed the dead wax area on both sides of it.

Handwritten/signed label copy went out with the adoption of paper labels
around 1900, but is there a listing anywhere of recordings afterward where
the performer signed the wax (or waxes) like Mary Garden did with this disc?

Has anyone here got the recording date(s) for the two sides of A 1190?
Here's what they are:

'John Anderson, my jo'  mx 19886-1
'Comin' thro' the rye'  mx 19887-1

Thanks!