Let me add a grain of salt here. Or two.
Hermesmonkey just kindly posted a couple of pictures of 2 authentic 25 cm Birkins in another thread (attached). There are material, obvious differences between H bags.
Size = amount of leather = weight.
Differences between 35s could be even more significant. One person measuring a bag in a leather is going to inevitably get different results from someone else measuring the "same" bag (size, leather), created by a different craftsperson.
And of course, the accuracy of scales varies from household to household, manufacturer to manufacturer.
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When we're talking in grams, these things make a difference.
ITA, these are good points, am glad you brought this up. This is why I posted the range of weights I got with different clemence bags. I used a tabletop, digital scale, that is accurate enough for post office mailings but beyond that I don't know how "accurate" it is. I weighed each bag at least twice, checked all the inner pockets first and left out the lock/clochette as previously mentioned.