The term "vintage" is used broadly and sometimes inaccurately. It can refer to anything that's twenty five to thirty years old but in general some vintage leather working tools can actually be classified as antiques. In their American heyday in the 1800's, leather workers were concentrated around northern urban centers in New York and New Jersey, though the craft eventually did spread from there to cover all parts of the United States.
Collectors tend to look for vintage leather working tools with a clear maker's stamp on them such as Rose, Dixon, Huber, Gomph, or Osborne. These are hand powered tools, not electric, each lovingly and individually crafted with rosewood handles and steel shafts, though those with brass shafts tend to be more highly valued.