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In some school of violin making, e.g. Mittenwald, the centre spine, if it is not from "Dutzenarbeit", should be sharp instead of ending with some delta. See the photo below. Is it also the case for the hand-made violin from the other school?
In other words: Does a violin spine that is not sharp or having a delta indicate that the violin is from Dutzenarbeit?
I think you do not understand what the term "Dutzendarbeit" means. This is a german term for a piece of workmanship that is not special, that is made "in dozens". So "Dutzendarbeit" is not a maker of violins or a school of making, but if someone refers to a violin as "Dutzendarbeit" he means that it is an instrument from mass production with limited but not necessarily no value.
So your question would really be: Can we deduce the production quality of a violin from certain elements of the carving, in this case the spine of the back of the pegbox.
My personal answer (but I am no expert) to this would be: To some extent. Obviously you’ll find the carving on a cheaply produced violin to be done with less effort than on a master’s work. If you look at the spine in the first picture you’ll see that it is carved much finer, and we do not see the scroll on the second one, but I think one would be able to see a difference in the carving. So my point is: Instead of looking for a single thing like a delta try to discern if the carve work is of high effort, if it has fine and clear lines and such. Even on instruments of highest value there can be a slight delta in such a spot.
Other thing to look out could be varnish, the general quality of the wood (is the back nicely figured?) and such.
