• Shell width.

    There is of course also a difference in diameter which could be used to identify what you have.

    Its not a big difference though so you’d need to be pretty accurate with your measurements, 34.8mm for English iso and 36mm for Italian.

  • Ah yes sorry getting my terminology mixed up! Okay, that’ll be the next measurement to make. Cheers

    Edit:
    Cursory glance at the plastic cup with the tape measure looks like 34.8 but I’ll double check with some callipers at the weekend.

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