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Thanks to Steve Tall and Square Peg. Great information, did it get us anywhere?
If Peg's single-bit Collins was not made by Kelly, then we can not say that unmarked axe heads are made by one company or the other definitively.
Also there are axes with numbers of ridges in the eye other than six, and we have not come up with any marked examples that have less than six ridges to shed any light on those axes.
The 1960 patent is interesting, I wonder if they thought they could get a new patent just by changing the number of ridges in the eye, or if the ridges were made or shaped in some other way to warrant a patent.
Looks like it is going to be a long process before we can identify unmarked axe heads by the number and shape of ridges in their eyes.....!
True Temper's patent for the eye ridges was Patent Number 3090653, filed 7/2/59 and granted 5/21/63. (Details at bottom.)
The information previously posted shows that the True Temper ridges were advertised from 1960 until 1982 (around the time that the Kelly axe factory was shut down). True Temper used the patented ridges on the Kelly Perfect, Woodslasher, and Flint Edge axes. During this period, the Kelly Perfects were evidently stamped and the Woodslasher and Flint Edges had no stamps (just label stickers). So I think it's likely that unstamped axes with ridges in the eye were originally labelled as Woodslasher or Flint Edge, and made during the period between 1960 and the early 1980s.
The axes with ridges and stamps from other makers, such as Collins or Vaughan, are still a mystery. These known exceptions so far are all stamped, unlike the Woodslasher and Flint Edges from True Temper. Perhaps Barco made some axes with ridges for Vaughan/Collins/Mann after Barco acquired Kelly Axe in 1987?
(Edited to add: YesteryearsTools says that "Some other brands previously used by other companies [in addition to Kelly] have reportedly been made by Barco but that has not been corroborated nor is the extent of the brand use been determined." )
http://www.yesteryearstools.com/Yesteryears%20Tools/Barco%20Industries.html
I would assume that the ridged eyes weren't manufactured before 1960, since the ad said the feature was new that year, and the patent was ultimately granted to Kelly (which generally wouldn't happen if other companies had been already making them).
Patent information:
https://www.google.com/patents/US3090653
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