The Old Town canoe with serial number 174066 is a 16 foot long Otca model with narrow two and 3/4 inch planking and a keel. It was built between June and September, 1964. The 1964 version of the filler was applied which probably didn't contain any white lead. The original exterior paint color was dark green and it was shipped on September 23rd or 24th, 1964 to Houston, Texas. A scan of this build record can be found by following the link at the attached thumbnail image below.
There are a total of six canoes that are 16 feet long in the 17406x range. The other records are also attached below in case one of them is a better match. You may want to attach some pictures of your canoe and the serial number in both ends. The location where you found it may also help since these canoes occasionally stay in the area of the original shipping destination. Feel free to reply here if you have any other questions.
Benson