Griggy,
I'm sorry. I looked up the wrong number, substituting a 7 for the 4. Hmmm...? Anyhow, looking up 148989 didn't help. That was a 15-foot canoe built in 1947 and shipped to Oneida Lake, N.Y. I also tried 48989, just in case the 1 was a phantom, but that canoe was 17-foot OTCA built in 1918. Could you measure the canoe from the longest point stem to stern and give us that number? Was it really 20 feet long?
Neither build record indicated half ribs, which your boat clearly has.
It appears to be an Old Town from the serial number and the diamond-head bolts. Others with more knowledge of these canoes might venture an opinion about the canoe. It's undergone some modifications, especially at the stern, and it appears to have been fiberglassed and probably a keel was removed. One interior stem seems much longer than normal.
Norm