Horatio
Subscriber
It seems that Leica continually made improvements/changes in the models. For instance the IIIf red dial's shutter has some ball bearings if I remember correctly.
The IIIf black dial's bottom plate added a "tab" to keep the film better positioned. All of these changes between models were minor. In fact I have discovered that
a lot of folks like model II.
The IIs seem pricier, and pricey is not in the budget.
How about the Russian copies, like a FED I?