David,
Thanks again for starting this thread. In the convex family of grinds, I distinguish between 3 variants. The first is the fully convex grind, usually but not always down to a zero edge. This would be like your diagram F. Opinels and most Bark Rivers would examples of this type of grind.
At the other extreme, is the so-called Scandi grind in which there is a sharp, crisp transition to the angled primary bevel and the primary bevel extends to the apex with no micro bevel. The Mora knives are an example of this. The idea being that you sharpen them by putting the entire flat bevel on the stone, almost like a double sided chisel.
In between is what I call a sabre grind, although I readily admit that this may not be the right or common usage. Like the scandi grind, there is a definite transition or shoulder to the grind. Much different than the continious curve of a pure convex grind. But, while definite, the transition is rounded or convexed. In this way, I see this as a convexed scandi or perhaps as a convex grind with a definite shoulder.
Here is my grandfathers unbranded fixed blade dated to the late 50s, in all probabily an import from Japan. You can see the shoulder line pretty clearly but it is also very much rounded and not to be confused with a pure scandi grind like you will find on a Mora.
Grandpas Knife by
Pinnah, on Flickr
I've tried in vain to find pictures of the earliest Buck fixed blades that I've seen here on this forum. But the ones I recall seeing remind me of my Grandfather's knife, as well as older American fixed blades from the 70s, 60s and 50s like those from Schrade-Walden, Marbles and Western.
BF member Thomas Linton posts regularly to the Traditional forum and he argues quite persuasively that the current "Scandi" grind (like you see on Moras) is a result of Mora and others trying to meet the misguided perspectives of British consumers. Thomas argues that actual traditional Scandanavian knives tend to be more what I'm referring to as as (convexed) sabre grind with a well rounded transition that develops naturally when you work the blade on the stone.
I find a (convexed) sabre grind to be wonderful for working wood. Yes, they split effectively (the grind is closely related to traditional splitting froes) but more importantly, they make good controlled shavings, as the wider, rounded apes allows for easy control of the cutting angle in the wood (for me, anyway). They also slice better than a pure scandi since they lack that abrupt sharp and friction producing shoulder.
I would be interesting to see Buck revive the old grinds, IMO. And made in the US.