I have just purchased a 13 1/2 foot Old Town Runabout from the Havre de Grace Maryland Maritime Museum. Serial number on the transom knee reads 13-6 which I assume is the boat length and then 160019. From the chart reviewed earlier it looks like 16000 series would be 1953. I then assume the 19 is the 19th built that year. Could someone provide additional information. The boat is natural- no paint on outer hull or bottom. Was there a stain used to darken the cedar or is the dark color ( sort of dark bear brown) a matter of age?