1816 Brock - Info Please

Greetings, good folks-- This is my first post in this forum. I am a casual collector of Canadian coins, with no particular goals or direction. I pick them up from junk silver tubs and the occasional auction mixed lot. It was one of those random lots that contained these two, along with a whole passel of large coppers of various denominations and localities. I have been unable to find any listing for the 1816 in my Krause catalog.. perhaps I overlooked it or it is listed somewhere else, or it's too obscure? Please enlighten me as to its place in the pantheon of Canadian coins. It seems to be older than anything else out there. These two seem to be very slightly different in some details, including planchet thickness. Too bad about the PMD. ): Thanks a heap!