Fake 1917 $1 Dominion of Canada??

News: Registration is free here at the CPMF!

Hey guys first post,
I was at a coin show couple weeks ago and purchased a handful of bills from a dealer, he gave me the "supposed fake" for free.
A couple things I find suspicious about the bill, the serial number is much different then the real note above (reffering to the picture). Left signature looks as if it was written with a marker, and top right corner tear was replaced with paper and coloured.

I'm relativley new to collecting bills so any input is appreciated.

{http://img708.imageshack.us/img708/1984/imagejdrr.jpg:http://img708.imageshack.us/img708/1984/imagejdrr.th.jpg}

{http://img443.imageshack.us/img443/1682/imageekgs.jpg:http://img443.imageshack.us/img443/1682/imageekgs.th.jpg}

It is either fake or was poorly touched up (after someone possibly tried to wash it [hint... look at the left signature]). My guess is the latter. btw I know the dealer that you got it from