Based upon several details in this image I believe it depicts a Canadian militiaman from soemtime in the late 1860s or early 1870s. His
belt buckle appears to be of a very plain general service variation with a crown in the center but without the usually seen motto regular
British belt plates. His cuff braid appears to date to the early 1870 period. The fact that no badges of any sort are to be seen on his tunic
lends to him being a member of the militia as opposed to a member of a British battalion stationed in Canada during the same time

1/6 Plate Tintype or Ferrotype
Unknown Photographer
c. 1870