Kevin,
My personal opinion is that these aluminium hilted daggers were manufactured and released in 1936, which is why they can be found with variant Pack 1st / 3rd cross-guards and the occasional slant and non slant grips and transitional trademarked blades. Puma I suspect just held a stock of early and slightly later parts, a bit like we see with some early Eickhorns, hence the mix of some confusing configs. It would be interesting to know if that one on Toms site is a tapered tang or not.
The small diamond Puma is the earliest trademark as far as I can remember, with the non-diamond only used for a short time in 36, although I could be wrong?.