I agree with Capt Chuck. The only changes I know of were the early 4 stringer 20 seacrafts changed to 2 big fat stringers around 1972. The pockets in the 20sf liner changed.
The 20 seafari got a different windshield about the same time. The 25 Seafari got a bigger step down in 1973 for more cabin headroom. There maybe some variations in Balsa/plywood used in coring the floor and gunnel caps.
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