I think your memory may be off on that. And scores needed vary by the scale of the different tests.
I recall my father got two different results on his acceptance letter, within a few points of each other, for two separate scales.
I didn’t keep his letter or Mensa card after he passed away, but I still have his blue t-shirt. I didn’t keep my letter (like I mentioned, this was over 30 years ago), but I remember his top number and mine.
He truly enjoyed the meetings he went to and made several friends through the organization.