I've been giving much thought to both the findings of Jim C. in his TD Type Study and in the Todd F. RHFT collection. The issue revolves around the removal by Sears of the "FORGED IN" handle marking, leaving just the "U.S.A." mark. One of my criteria in the RHFT for defining what is a major Type as opposed to a variation within a Type is if the visible feature being considered represents a distinct delineator in the RHFT timeline, or in other words, a chronological distinction where one feature ends at such a time and another supersedes it. I also had to consider whether the feature change was striking enough to merit its own Type classification. To put it another way, did the change effect the overall meaning of the artifact with respect to the RHFT history? Was the feature an important 'event' within the RHFT story?
For example, in the Type List, we have a number of footnoted (f) variations for which I made certain judgement calls based on these criteria. The double spacing noted in f1 did not change the overall meaning of Type 1 markings in the timeline, and its dating uncertain. Based on the randomness of f2, it's impossible to date, nor does it affect the historical meaning of Types 3 through 6. The same can be said for the occasional -VV- in Type 6. We could determine that the f4 change from small to large model numbers happened sequentially in the timeline, but the date of the change is ambiguous while the distinguishing information on both are still the same (i.e., one could still accurately identify both the distinctness of Type 7 and its place within the RHFT history regardless to small or large model number). According to Lauver, most of the various mfr codes in Type 9 (noted by f5) ran concurrently so are impossible to sequentially date them, nor do they otherwise change the distinguishing information found on that Type.
Now we come to the latest finding that there appears to be reasonably firm date range for the removal of the "FORGED IN" marking. It also presents a distinct change in the information markings on the handle. Moreover, it indeed appears sequential in that once the FORGED IN is dropped, it never appears again, making a major distinction between 'before' and 'after' examples with a correspondingly different date range. This seems to meet all my given criteria for a major Type.
Should I add a Type 10 for this change, or simply list it as a variation? Your thoughts?