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I had a 1972 Standard 13' Red dot hull which was owned by a fire dept. It was blue inside with a 20" transom with the sink splash well in the back. After that year they were tan inside. The only drawback with the post 1971 models is they didn't come standard with oar lock holders which made them row pretty good with a light engine on the back.
Check the stencil # on your transom to make sure what year it is.
1971 models run from 2A 5601 to 2A 7800
1972 models run from 2A 7801 to 2B 000
1973 models run from 2B 001 to 2B 2700
I have a beat up old 1968? 13 that I use to get to my mooring. I might be interested in yours. What state are you in? Let see those pictures.