Well that rules out, it being a Colonial. Which is a good thing in my opinion. Wenger scales will probably be difficult to source. Colonial scales would be impossible, or close to it.
If you can't find new scales, you can fill that with epoxy. I have used JB Weld. It works, but is an ugly grey color. You could use the 5 minute epoxy that comes in the syringe type dispenser, or any other epoxy you might have. Mix it as it instructions say, then thicken it to a paste. Fiberglass and epoxy specialty stores sell fumed silica for this, but white flour, or fine sanding wood dust will work fine too. Get some red dye. Again Specialty fiberglass and epoxy stores, will likely have a dye they sell, but I'm betting red food color will work fine. So Mix up your epoxy. Thicken it till it will hold it's shape without slumping, or at least very little slumping. Add some red dye or stain, till you match the red in the scale's color. Useing a putty knife or popsicle stick, fill the void and shape the missing end to the scale. After the epoxy cures, clean it up with sandpaper. Working from course to fine, till you get whatever finish you want.
O.B.