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Vince,
The RPS was an optional seat.

The boat could be:
1. Nauset with optional RPS
https://www.whalercentral.com/userpho...lbum_id=17

2. Eastport with optional RPS
https://www.whalercentral.com/userpho...lbum_id=15
https://www.whalercentral.com/forum/a...stport.jpg

3. Sakonnet with standard RPS and Forward Platform
https://www.whalercentral.com/userpho...lbum_id=26
https://www.whalercentral.com/images/...konnet.jpg

I see far too many people think they own a Sakonnet just because they have an RPS.
That is not true.
They have to have the Forward Platform (or evidence of the platform removed) during the years 1963-1973 when the Eastport and Nauset where still in production.

Hope that helps you narrow it down and let us know.