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A = gearbox model with power feed apron
B = power feed apron no gearbox
C = base model, no gearbox or power feed apron
D = double drive shaft, leadscrew for thread cutting and driveshaft for turning
F = fast (high speed model with roller bearing countershaft}
G = geared head model (260 models only)
H = hardened bed
L = long 49" bed (standard length 40")
M = metric model (all others are imperial)
N = instrument version ( I take it this is the high precision model)
R = tapered roller bearing headstock (9" models)
T = belt drive version ( only used on the 260)
U = under bench drive. (Craftsman models)
V = Bit of a guess with this one but I think it refers to 110v 60hz electrics as they all seem to be Canadian exported machines. The "V" referring to voltage

These are all the variants that have shown up in the 2000 odd machines I have registered so far.
Mal
Australian Metalworking Hobbyist