My handwriting. My signature. But I did not send these letters.

6 seconds sound clip from The Master (1984) - Kunoichi (S1E9) sitcom.

You can hear this line at 00:25:15.689 in the Blu-ray version of the TV Series.

Quote context

[...]

(Dog barking)

(Ninja smoke bomb)

- Signed, John Peter McAllister.

- There's only one man that could duplicate my writing. Okasa.

- Did you find what you were looking for, John?

- My handwriting. My signature. But I did not send these letters.

- When did you start receiving these?

- Several weeks ago.

- You described yourself as a ninja. It was a subculture. I remember it was an obsession with you.

- Take a look at this outfit. It still is.

- Allison was attacked by three of them today. I wouldn't have rescued her if they were my students. Nor would I have come back here and tried to clear my name with you.

- I can talk a lot better without that gun pointing at me.

[...]