On my '73 20SF, the only piano hinges are on the glove box hatch on the console, and the bench seat lid. All of the deck hatches use regular hinges.
Like Don said, look for evidence that screw holes have been repaired.
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1973 Seacraft 20' SF "Sea Dog"
1988 Tracker/Seacraft 23' WA "Salty Dog"
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