IMO the etching on the blade is too clean for an acid etching process. Every time I make extremely enlargings of my dagger pictures I see things get rough. The limits of this etching process I guess. This SA etch is so crisp and perfect and remembers me more on the high tec applied logo's I see on common knives that leaving the Solinger manufacturer firms today. Maybe I'm not the greatest blade expert but on my work I spend my time to take a good look at the new Solinger maker marks on the knives that arrive in our shop. Every modern common household knives have these logo's in an extremely crisp way, just like that doubtfull blade on top of this thread.
