Thanks DW, I appreciate the lead. I shall turn to the Germans for resources.
In the conversation about toe plates, I put them on all my shoes as something about my biomechanics leave the toes with more wear. I really don't have much issue with noise (or I have just habituated to it) so the utility outweights premature sole wear.
Interestingly, I have minimal heel lift wear and more often than not replace soles before I even get through half of the rubber lift. I know many end up having to replace this at least once before a resole.
I keep forgetting the folks at O. Baltor & sons in San Francisco. They have much of the same stock as Goetz.
FWIW, IMO, the toe plates that are not inset are less detrimental than flush plates.