It appears to be original but with modifications. The reverseable backrest and its side rail was teak
The aluminium slide was a little different. Attached picture of the seat i still have from my '73 20' very hravy and well built. You can also see a picture from the the brochure available on this site.
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1978 23' Superfish/Potter Bracket 250HP --------
as "Americans" you have the right to ......
"LIFE, LIBERTY and the PURSUIT of a Classic SeaCraft" -capt_chuck
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