This thread piqued my interest in terms of how many pre-Liberty Blue Note LPs I had. Alas, I have discovered only five, all with New York, USA labels.
I immediately noticed that the vinyl appears to be heavier and the cardboard sleeve as well appears make of heavier cardboard stock than the varied reissue LPs in my collection.
I've got copies of:
Big John Patton, Got a Good Thing Goin (mono)
Duke Pearson, Wahoo (mono)
Dexter Gordon, A Swinging Affair (mono)
Hank Mobley, Workout (stereo)
George Braith, Two Souls in One (mono).
Now I'm going to have to listen to these again.