Classic Lee Loaders made prior to 1985 were stamped with a letter, typically on the bottom of the tool, which represented the caliber. To help identify which caliber Lee Loader it might be, I have provided the list below.
A = 38 Super or 38 S&W
G = 45 ACP
H = 38 Special or 357 Mag
J = 41 Mag
N = 30 M1 Carbine
X = 44 Mag
Y = 9mm Luger
Z = 45 Long Colt