weight of 1 reale cob

[Boatlode]

I have a worn but legible 1700 1 reale from Lima. It weighs 2.1 grams. Is that much weight loss typical for a cob?

Edited to add photo:

 

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[tormes]

Hi. Standard weight must be 3,3 gr., diameter 20mm and .917 silver (rich).

t.

 

[Cross Potent]

Its been clipped which was common.