Siegmund Klein (April 10, 1902 – May 24, 1987) was an American strongman and gym owner. He was known for his strength as well as his physique, he maintained a bodyweight of around 150lbs throughout his life, even when older he still lifted, trained and stayed in great shape. He ran his gym in New York from July 1926 until 1974. He also published his own Magazine entitled "Klein's Bell" from Jun 1931 to December 1932.
Below, the first pamphlet, Super physique, is more an advertisement piece for his gym and equipment lines including some photographs of the gym at 717 seventh avenue. There are also two volumes of magazine that Klein published. There are some fascinating pieces about lifting generally as well as thoughts and musings form Klein.
Super Physique
Kleins Bell Volume 1
Kleins Bell Volume 2