I would give it as a fact that one should hesitate in determining the blade length of these swords... that not necessarily rapiers; at least in practical terms, once those beat whatever written in books.
The six examples in my little collection vary from 69 to 98 cm.(69-80-82-83-86-98).
... And the twelve units of a collection catalogued by someone from whom i have acquired a couple of mine, vary from 81 to 134 cm. (81-83-88-89-89-93-98-100-103-104-
124-132). To be taken into account that the two largest ones are not to be considered as 'normal'; the so called 'off the mark', prohibited by the period authorities ... and very rare to find out there.
We may assume that, when comes to practice, rather than following a standard length, blades often followed owners conveniences, when they didn't have an average stature: short for a rather short owner, large for a rather tall one. Whether those for the shorties are commissioned to their size or shortened after acquisition, is another issue.
And then, i would guess, come the ones that are shortened for different reasons, like having been broken by accident.
I hope not to be taken too seriously, as i am no expert either

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PS
And i would like to further point out that, the one i have with the widest blade, is the shortest one.
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