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Two of them, Bill

model 75 1/2 is 3.5/8" (11 mm)
model 59 1/2 is 3.5/8" (11 mm)
model 88 is 4/8"
model 28 is 4/8"
model 77 is 4/8"
model 40 is 4/8"
model 38 is 4.5/8"
model 78 is almost...

I have about five different models here that are rather 4/8" or less.
No 64 though. Doesn't seem to be unusual.