Quite a collection! Me-thinks you did a raid in the Philadelphia area!
21809 appears on a 18' HW model in AA grade with mahogany outside rails, seats, decks and thwarts. It had a keel and outside stems, a mast step and mast seat and a "locker under the bow deck" a notation I have not seen before. It was painted white and shipped to Philadelphia in May of 1912.
61831 appears on an 18' Otca Model in AA grade, mahogany rails, seats, decks and thwarts, and a keel. It was painted Light Blue with a 2" dark blue stripe with what I believe is TD (turned down?) ends. It was shipped to Philiadelphia in December of 1920.
126057 appears on a 18' Otca in CS (common Sense) grade, with spruce rails, birch seats, decks and thwarts a keel and a floor rack. It was painted dark green and shipped to Camden NJ (across the bridge from Philadelphia) in June of 1940. No mention of sailing hardware, but that was often added afterwards.
Copies of all three build records are attached.
Market value is often difficult to determine, but you may get some ideas here...
http://forums.wcha.org/showthread.php?t=57
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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.