1982 d small date

i know its in bad condition but is that another mm below the original thanks for any info.

 

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also only weighs 2.56

 

The start of zinc rot, IMO. Thin copper coating over zinc core, 2.5 g is the normal weight

 

No that is just a zinc blister.

 

No, it's a blister from being on a zinc planchet. It will slowly rot over time.

 

Your coin is a small date zilincon,weight,it might be a thick planchet at 2.56 if your scale is accurate.