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Holy smokes Steve! Informative pictures. Not only does the Woodslasher label on that unstamped head (model 35M2K) indicate that there are eye ridges but it also says 'wear safety goggles'. Same goes with the double bit Woodslasher (model 25M2K) without eye ridges. If I recall 'wear safety goggles' became compulsory print on n. American striking tools in the mid to late 1970s. Perhaps TT was ahead of it's time and was already labelling them with such a warning before 1960, or else the double bit was manufactured sometime after 1982.
As detailed in an earlier post (below), OSHA and ANSI worked together in 1976 on some workplace safety standards. ANSI later issued updated standards for "Heavy Striking Tools -- Safety Requirements". An article from 1977 says that "Each hammer meeting the ANSI safety standard is required to carry a warning statement alerting the user to the danger of eye injury and urging the use of safety goggles." So, I would conclude that tools with a safety goggles warning were probably made around 1977 or later.
I did some digging to see if I could find any indication of the year when manufacturers started putting "Wear Safety Goggles" on axes, mauls, hammers, etc. Knowing this could help with figuring out just how "vintage" is that vintage tool.
Some recollections from 300Six narrow it down to somewhere approximately between 1972 and 1985:
The earliest references I found were some newspaper articles from the late 1970s, like this article from 1977 that said:
"Each hammer meeting the ANSI safety standard is required to carry a warning statement alerting the user to the danger of eye injury and urging the use of safety goggles."
Another reference identifies the ANSI standard for "Heavy Striking Tools -- Safety Requirements" as ANSI/HTI B 173.3
This history of ANSI gives a possible origin for these warning statements on tools:
"In 1976, ANSI and the Occupational Safety and Health Administration established a joint coordinating committee for private-public sector voluntary standards activities that affect safety and health in the workplace."
My conclusion is that a "Wear Safety Goggles" stamp or label means that the tool was not made before the late 1970s.