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Spotting a given maker's work is not that hard if you a significant degree of familiarity with it.
As for regional "looks" - yes, they exist - but only in a very generalized sense. Arkansas and Montana for sure. Not so sure about Texas.
Roger
True, spotting a maker's "mark" is not difficult, however knowing which maker's mark or configuration of marks a veteran maker (Fisk for example) used at various periods in his/her career is extremely helpful in determining when a knife was made.