Comment by W.B.lbl:
Must've been 75.5mm (2.9724") before pressing. I noticed that they veered between that and 76.5mm (3.0118") for their label die-cutting size (by my calculations, they lost about 0.5mm, or 0.6 - 0.65%, of its original size, when pressed onto the shellac). All this based on the pressing ring - about 16mm (0.6299").