LEGO Set - 5521 - Model Team - Sea Jet

Lego System Model Team set no. 5521 with instructions and box. To the best of my knowledge, one brick is missing behind the seats. In my opinion, in good condition for a set that is 30 years old. Sold as depicted in the photos. I am selling 4 sets with boxes: 5521, 6346, 6544 and 8660.