gsmith7158 wrote:The more I look at the knife, I just keep thinking 65-69 red bone.
If one had the "eye" for cases (i.e. knows them very well) can they tell a difference in the era of the bone itself? For example 40-64 redbone vs 65-69 redbone, is there any "era" difference besides the individuality of the bone and dye itself? I hope my question makes some sense.
Your question makes sense to me. There are some differences from era to era, but there's no clear cut "line of demarcation" that I'm aware of. I doubt someone at Case said, "We're changing the tang stamps so let's change the jigging tool and the dye too." Tooling wears with use, so there would be gradual changes in the appearance of jigging patterns over time. Knife-to-knife differences in the hafting process during manufacturing also can affect the appearance of jigging.
Some folks seem able to assign certain jigging appearances to specific eras but I'm not one of them (with exceptions like Rogers bone for example). Dye colors like green bone are easier for me to spot. Any ability to tell the differences requires a LOT of hands-on looking at knives IMHO. And the ability to describe the differences requires far better wordsmith ability than I have. The best descriptions and pics I know of are found in Steve Pfeiffer's book.
The best I can do for you is a picture of three near mint 06267 pattern examples. Picture should enlarge by clicking on it. The knives pictured top to bottom are Tested, XX, and USA eras. You can see some subtle differences in jigging on the the first two and more marked differences in the USA knife. Hard to tell from the picture but the Tested knife is green bone. Any conclusions are up to you.
Maybe someone else can do a better job of explaining.