Pat. # 91,704 June 22 ,1869 .The whistle is made of a tin metal sheet .
I found the actual sample in 2005
Drawing of the Patent, originally designed to be made in large size as steam whistle of brass, or a small tin mouth whistle.
Continue reading The First Known Patent for an American Escargot, Snail, Referee Type Whistle 1869 USA Patent , Early American whistles (1) A.Strauss