Thanks LT. That would have been my guess as to the reason for the serrations only on one side. If you have ever tried to resharpen one with both sides serrated, it is a pain and can only really be accomplished with a rattail or chainsaw file matching the radius of the serrations.
I have been exploring the old George Schrade Stagbrand, Schradebrand, and Schrade-Walden leather handled, aluminum pommel knives and you are right... they just sorta grew into the Old Timers through the intervening years. And I noticed that several other companies jumped on the design with leather, bakelite, and fauxstag handles. Boulder, Marbles, Buck, Queen, Case and more produced similar models of George's design. Buck is, I think, one of the few to still produce those old designs, though the serrations have mostly become half-blade and not usually on a traditional hunter pattern. And the aluminum birds head pommel is made of sturdier, shinier stuff now.
Codger