the HW-19 Jr had an acrylic platter. The III platter is a 10pd lead/acrylic affair.
I believe the difference between the Mark II and Mark III is the material (mdf vs acrylic) used in the subchassis and plinth.
http://audiokarma.org/forums/showthread.php?t=357890
I believe the difference between the Mark II and Mark III is the material (mdf vs acrylic) used in the subchassis and plinth.
http://audiokarma.org/forums/showthread.php?t=357890