Nixon looks like it might be printed but Armstrong looks like it’s signed on the glass itself. If it’s not real it would be a forgery since I don’t believe it’s autopen and definitely not printed. Not sure if Armstrong is authentic. Last name looks a little atypical to me but I have not studied his signature extensively so I could be wrong.
The Nixon and the Blount are obviously printed. Same color "ink" and all those unnatural breaks. If the Armstrong is good I don't have a clue what it would be worth in paint pen on glass.