Thank you AH every contribution contributes, you know. Really, take also this G there, it conforms to my theory exactly which is if we make a y axis and an x axis intersecting at the center of the figure, G,D,W and so on & so on, whatever it might be, at right angles and corresponding to the upright orientation of the letter then one extension of either axis will indicate the
sweet spot on the edge.
The thought of the klompenmaker struck me already, how could it be otherwise, but the sweep of the blade heel to toe of the axe in question has no application in that work.
These extra photos sent today by the one who'd sent the axe itself showing similar ones and some indication of reasonable handling options
Worth noting on each example that the apex of the sweep,(photo #3), as opposed to the arch, appears to be below the center line and that also corresponded to the odd placement of the D, the G corresponding with the central apex of the edge's arch. Coincidence?