You should really check the cat yourself before considering to buy it. Often you can't tell what it would be like in real, when you just have some photos.
Normally you should check the underwater hulls (for corrasion, dings etc.), deck (soft spots -> early hc's are prone to soft spots).
Is there any distortion when you are lifting just one of the hulls. It should be common that there is a rigidity.
Are there any service hatches? It can be a hint for some recently accomplished repairs.
Check the gaskets at important places.
Check the sails for patches, batten-pockets, clew plates ...
There is so much more, and these things are not true for every HC, just take a look and decide with a gut instinct
Nice sails by the way ...
Greets,
Seb