This is one time I agree that it should be certified (once we are satisfied that it looks good), as much for authenticity as anything else. Also, assuming that it is authentic, an auction would get you the best price, even after the fees, because it opens the market very wide. Selling it to a local dealer would not get you the best price, because the market for such an item in Ottawa (and I should know, since I am from Ottawa) is very thin. The only problem with an auction is that it will take some time to get your money.
The simple rule is, you can either maximize your gain, or get your money quickly, but not both.
Sorry mate , you have what appears to be a cast fake in my learned opinion. Compare your photos to a few of the real ones sold . HA.com is a great place to start . Has all the ear marks of the Lebanese Counterfeit coins that were common in the 1960s and 1970s . Amongst others (ie US gold Coins) they have full gold and were made primarily to get around US Importation bans on Gold at the time .
Yes, I concur with Pacificoin, most likely a jeweller's copy. The design isn't quite right, a little too mushy and ill-defined. The rims are wrong too. I would though still have it examined 'in hand' by someone if you're in any doubt. Here's a 1917 S for comparison. Different mint but, apart from this having the identifying 'S', they should otherwise look the same.