I found a seemingly goodish rap (I cut-and-pasted in a Word doc.) on Kelly axes which says Kelly relocated to Charleston, WV, in 1904. Here's a link to the hist. of Kelly linked from an American Fork & Hoe Co. history:
http://www.yesteryearstools.com/Yesteryears%20Tools/Kelly%20Axe%20Mfg.%20Co.%20.html I'd not remembered that practically all the axe "brands" I'm familiar with fall under an American Fork & Hoe Co. umbrella. Seems they were kinda like Stanley, in that they bought up anyone who might've been a competitor?
My own go-to "framing hammer" is a waffle-headed 28 oz. Plumb rig-axe, which I was told by an uncle was made famous by the U.S.Army Corps of Engineers (of which Uncle Alan was a member during WWII in the Pacific Theater). They're not a "broad hatchet" because they have two bevels, but I reckon the hacking action/function is at least similar-enuf to your tool. Could C-of-E WWII vets have influenced union tool-kit requirements in the '70s? Entirely possible, I reckon. Two days of using one to frame a huge replacement roof made me a convert — one tap to set a 16d common in place and one to sink it flush beat the tar out of tap-tap-tap-tapping w/ 16-18 oz. hammers. Other carpenters in 1970s-1990s New Mexico sneered and called them "California framing hammers." I can see the benefit of the single-bevel/broad-hatchet variety, but only as long as it has a waffle-head — to me an I-refuse-to-do-without innovation in my rig-axe.
I'd add to Scottg's Oct. 16 post that typically the "bent handle" idea has the handle offset a bit to the right (if you're right-handed), so the handle more-easily clears the flattening work you're on. But that's timber-frame thinking, not rig-axe/glorified-hammer thinking.
And on the handle-acquisition side of things, I have several broad-axe and -hatchet heads that need handles but my queries of handle suppliers haven't located anyone who specifically makes them. Yet. And yeah, I always keep an eye out for possible broad-whatever handle stock in my mixed-species north central Idaho forest, so far w/o joy. Perhaps I'm too much of a stickler for continuous grain-direction? Possibly. * he gives out with a smallish smile and tries to blush, but fails miserably*
As usual, I learned some things from this thread, so thanks, y'all. -bear