Hello Bee See
Your fancy "S" cancel (although only a partial strike, strongly resembles that used in Shelburne, Ontario between May 1876 and January 1877.

The hammer was recorded by Day & Smythies as #697 and by David Lacelle as #768.
If you are interested in fancy cancels, you should purchase a copy of "Fancy Cancels on Canadian Stamps, 1855 to 1950" by David Lacelle and published by BNAPS. It is available from Ian Kimmerly in Ottawa.
If you join BNAPS, you will get a 40% discount on BNAPS publications which will go a long way towards covering your annual dues.
GJP