I believe these are all white label test pressings or masters. I don't
think the "L.M." relates directly to the matrix number that is also stamped
on the label.
The L.M. stamp is upside down on this one, so it seems it is not stamped at
the same time as the number below it.
I don't know for sure what L.M. means, but my guess is "lacquer matrix" or
"lacquer master." A lot of similar discs I have handled seem to be made of
lacquer, not shellac. You don't mention the material of these discs in your
Just my two cents...
On Wed, Jan 17, 2018 at 7:38 AM, Brewster Kahle <[log in to unmask]>
> As we have been digitizing collections that have been donated,
> we now have 355 sides that have Decca labels with handwritten title and
> performer with L.M. and a number.
> Does anyone know what these are?