small notes without small key?

[Felix Hammer]

Hello

I tried to decrease the size of some notes with 

\score [
\new Staff {
   \relative c' {
        \clef treble
        \key c \major
        \time 19/1
        \set Staff.fontSize = #-5
        g1 a b \set Staff.fontSize = #+1 c1 d e f g a b c d e f g a b c \bar 
"|." 

Now i have the Problem that the KeySignature is also small like -5. 
I have tried
        
  \key c \major
        \time 19/1
        \set Staff.fontSize = #-5
        \override KeySignature #'font-size = #+1 
        g1 a b \set Staff.fontSize = #+1 c1 d e f g a b c d e f g a b c \bar 
"|." 

but it doesnt work. I didn't get a bigger key. 
Can anybody help me?

Felix

        

        
                
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