Here's what you've been looking for: 1930s cap toes made from brown alligator leather in a whopping size 14!!! They seem to be quite narrow, though.
http://www.ebay.com/itm/Vintage-1930s-Brown-Cap-Toe-Oxford-Shoes-Mens-14-3E-/390535418185?pt=US_Mens_Vintage_Shoes&hash=item5aedb99149
http://www.ebay.com/itm/Vintage-1930s-Brown-Cap-Toe-Oxford-Shoes-Mens-14-3E-/390535418185?pt=US_Mens_Vintage_Shoes&hash=item5aedb99149