hello
you may wish to read sentence four of paragraph two of page 12 of this (sorry this link but I cannot find otherwise in English, this is the only time I am aware it was written published in English since last 100 years);
https://www.yumpu.com/en/document/re...a-edition-2020
Also you might wish to contact Wacker or others still producing today, and ask them which is correct,
your isosceles triangle cutting edge or is the specification to be another form.
While I cannot speak for other location razor production, since ~1885 from Solingen production for hollow ground razors, the goal is always to produce a concave cutting edge, and when grinders say the "cutting edge" we mean the entire bevel form, not the line you show from aside as in America. This was done historically with a small fine wheel powered by foot action, but those are no longer produced and now a hone shaped as wheel portion is used instead. Please come to the Deutsches Klingenmuseum, you will see wonderful pictures from this time period now gone, and they include workstation images ~1900-1910 where you can see wedge grind razors for barbers being honed on flat whetstone while wheel stations for hollow ground finishing (many more) are being used. I do not imagine why you would believe a grinder with access to each would actively choose the flat object instead?
Our industry is working since 2019 on a machinery developed which will be used by all the Solingen productions soon and is a device which can measure with extreme accuracy the cutting edge thickness and edge radius, but without damaging the fragile edge, and with the high resolution required. We are calling this machine for now "the shave-ready machine", in honor of the strong American market. Each new razor will come with an individual certification using objective metrics from the individual test, much like if you purchase a costly moving coil phono cartridge. The test will indicate thickness and radius at several positions upon the cutting edge. I assure you that no "not shave ready" cutting edge can exceed these stringent metrics. Multiple producers in Solingen are adopting this standardization and it will occur soon, perhaps within this year. It will certainly be interesting at that point to read the American forum responses from the experts as yourself.
greetings from Germany, as likely the only participant active in Solingen cutlery posting to your fine forum, we need all of you for German cutlery to continue!