There's a website dedicated to him, here's the link http://www.reocities.com/boxofdaylight/Home.htm This is going to be some good reading. There is a wealth of information about Sanstol who fought among others Sixto Escobar, Panama Al Brown, Young Perez, Midget Wolgast, Speedy Dado, Emile Pladner, Pinky Silverberg & was never stopped. Claimed the Canadian Boxing Federation & Montreal Athletic Commission World Bantamweight Title but lost in a challenge (split decison) for the NYSAC & NBA to Panama Al Brown. This content is protected Short clip of Brown & Sanstol sparring seperately for their fight in 1935 - http://www.youtube.com/watch?v=csjPWwq2p0A There's a ton of info on boxrec including quite a few write up's of individual fights - here's his bio page http://boxrec.com/media/index.php?title=Human:9935
