Very nice boat.
And Eric, that is likely GROSS TONNAGE that is stated. Gross tonnage is a measure of volume more than anything and really has nothing to do with the actual weight of the boat. It is usually on the certificate of documentation and likely what the seller used in the ad.
<<So GT is a kind of capacity-derived index that is used to rank a ship for purposes of determining manning, safety and other statutory requirements and is expressed simply as GT, which is a unitless entity, even though its derivation is tied to the cubic meter unit of volumetric capacity.>>
Everything you wanted to know about tonnage:
Tonnage - Wikipedia, the free encyclopedia