Real of fake Principality of Antioch coin?

Hello,

Saw this coin for auction but got a red flag regarding the weight.
It's 2.6g and here at numista (N#42004) says 3.6g. I understand that some variation occurred at that time, but 1g?

any help is much appreciated.

thank you

Yes right is antioch tancred

The coin looks fine to me. The weight of these crudely struck hammered is bound to vary. Natural wear, clipping, and planchet differences can explain discrepancies.