173219 was assigned to a 16' Old Town Guide model with a keel. It was painted GS (Guide's Special) Green and shipped to Louisville, KY on 9/3/64.
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It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Feel free to reply here if you have any other questions.
176051 in my barn is a 16' 1966 Guide with GS Green. I've attached two photos. The GS Green is flanked by Kirby's Blind Green. The Gs Green is origional as it is a one owner boat and there are no signs of any prior canvas work. ie. no extra holes. Blind green is the closest shade from the Kirby color chart. Computers being what they are you may have some color variation BUT the Blind Green can sort of set the bar.