Mack Sennett signed September 15th, 1930 appreciation letter. 

Signature: Black Ink Pen

Authentication: PSA/DNA Letter of Authentication

Mack Sennett was a Canadian-born American director and actor. He is known as an innovator of slapstick comedy in film and was known at times as the "King of Comedy". He was awareded for Best Live Action Short Film in 1932 and earned an Academy Honorary Award in 1937.