The Oldest Farm Building?

Along Lealhom side in the Esk valley there is a an delapitated old farm and several run down buildings.  Above one on the lintel is carved the date  1680 and in two separate panels, the initials 'TT" & 'TT' in the second panel also.

This is probably the oldest dated building in the North Yorkshire Moors.  Like the rest of the buildings it is in a poor condition and will, eventually fall down.  A shame if it does