Thanks for bringing this guy to my attention Bee See!
I agree some other stamps also have nicks and missing bits here and there, but his shipping is extremely low compared to others.
0.50 to US and 1.00 worldwide with extra items combined free. Don't see that too often.
His use of grading is strange to me. On cut squares he calls them F-VF used or mint never hinged? Maybe just jis idea of thir relative condition I suppose.
Here is a nice Austria 28 with a SON CDS cancel for 0.50. This is graded as average used, maybe there are hidden faults or perhaps he is not used to seeing old Austria stamps?