Opinions On Gum Condition, Germany, Nothilfe Sheet, Michel 2

I am rather new to the stamp collecting field and am interested in hearing from other collectors about this souvenir sheet. It was described as MNH og. Upon examination, I noted some hairs in the gum and, I am not sure if the Schlegel marks are authentic. To me, it would seem plausible that small unwanted pieces of debris could end up in the original gum of stamps. But, I have basically no experience in assessing the gum of stamps that are billed as MNH og (ie basically perfect specimens). Any opinions would be greatly appreciated. Thanks!