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Being metric they're not exactly 6/8ths of course, but my Mk32s are all slightly over 6/8 size themselves (about 49-50/64ths). That's interesting that #33's would only be 1/32 larger than that... I...

In the #3x range at least the last digit indicates the size. #30 is 4/8, #31 is 5/8, and #32 is 6/8. I've never seen a #33...