Che Genere Di Carta Usata?

Salve a tutti voi del forum.Sono appassionato si filatelia statunitense,da premettere che sono un principiante in materia e scusatemi per eventuali miei errori di valutazioni.Chiedo il vostro parere su questo 3 cent specificatamente sul tipo di carta usata con eccessiva porosita' tanto da deturparne il viso.Secondo il vostro parere che genere di carta veniva usata per questi esemplari?E normale?Vi ringrazio anticipatamente.

A translation using the DeepL language translation program:

"Hello to all of you in the forum, I am passionate about American philately, I must say that I am a beginner in this field and I apologize for any errors of judgment, I ask your opinion on this 3 cents specifically on the type of paper used with excessive porosity 'so as to disfigure the face, in your opinion what kind of paper was used for these samples?"

Hi.I ask in reference to my request for identification on the type of paper used on the 3 cents, not having received any response I wondered if by chance I would have made a mistake in submitting my application.Let me know.Thank you.

It looks to me like it was possibly mounted in a stick down photo type album and the sticky dots on the photo album page migrated partially to the stamp. Just a guess.

This forum has a section specialized for US classic stamps.

Try posting your question there.

https://goscf.com/f/15

Thank you very much.