Got some up the mountain at the back of the property.
Gonna leave it there, though. Lots of bug-kill lower down that I can harvest and yard out a lot easier (pine, spruce, fir -- we got hit with a huge infestation of pests a few years ago).
It's a guess. According to the "Holy Book" Collins bought up the Sager (Warren) brand in 1950 but kept the brand separate until around 1958. (If I remember correctly...)
I've observed a number of Sagers going by on this site that are date-stamped and also stamped with reference to the Sager Chemical Process. My reading tells me that at one time Sager was THE brand in the woods. I can't see them putting LESS advertising on their heads unless they'd come down to being just another brand in someone's stable. Old advertising I've seen from the '20s and so on seems to show that in those days, if a company had more than one brand under its roof, that they differentiated the brands with special labels and stampings.
This is so minimalist I'm guessing it's later. Kind of like, "We want you to buy it because it's a Sager. But it's not a Sager, really, it's a Collins. That's why we don't make a big deal out of it."
I seem to recall seeing Sager Chemical axes at least up to 1948. We're back in guesswork territory, but if true that would indicate the chemical process was in use right up to the sale, or nearly. Not seeing any trace of bluing or other chemical indication on either one of my Sager heads, I'm thinking that they're from the Collins era. Good using axes, in other words, but not "store in dry nitrogen atmosphere" level. Probably this felling axe will be displayed more than used, but like others on this board I'll probably take it out and try it.