All the european rudders will be the square bottom ones.
The boat may have a mylar or dacron mainsail, not much to choose between the two. Mylar jibs are rare and don't last very long.
The 18.2 hulls did dent pretty easily [into the foam sandwich] only cosmetic though.
Some of the hulls split down the bow - press each side of the bow with the palms of hands to see if it opens up any. Squeeze filler/resin into the crack if needed.
If the boat has been dragged up the beach a bit, the leading edge of the centerboards can get worn and possibly delaminate when sailing at speed.

Decent design to sail if you are not too heavey. good luck

paul