hello, I picked up an old gillette it only has a comb on one side. the other side has no bar, no comb. It only has a rounded edge under right under the head edge. The blade just hangs out there. Anybody know exactly why they made these? Maybe for cutting a beard off? or to trim the back of the neck straight across. Its made in canada in the first decade of 1900. I could use some more info, please. thanks