[Phil Froman]

I believe that may be a Cape Dory 30C or a 30K modified into a 30C.
The five ports were more common on the K, but that’s not to say they didn’t build a few 30c’s that way. If it’s later than 1972 a hull number should be available and you can decipher the builder from that. The boat may be documented and you can search the boats name in the database for more information- https://www.fisheries.noaa.gov/foss/f?p=215:4:11569857015013:::::