How do you determine an original Barnes?
Barnes was making bullets and marketing them prior to WW2.
When he started he started up again after WW2 he made quite a unique bullet, using ordinary small copper tubing, the same as you can buy in a hardware store, as bullet jackets. He bonded a lead core in them, squeezed them into shape with a bit of lead showing at the nose and a copper base.
Of course, these jackets were several times thicker than regular bullet jackets, thus they expanded, but hung together about the same as the all alloy brass bullets that are so highly praised today.
I have shot moose with a 30-06 using these bullets, in both 150 and 200 grain weight and still have 2 or 3 of these old Barnes bullets in 30 calibre, 200 grain.