From Wikipedia:
The first National Hardware Show took place in New York City in 1945 and was created by Abe Rosenburg of General Tools, along with Charlie Snitow, General's Chief Legal Council.
In the early 1960s, Reed Exhibitions (previously Cahners Expositions Group) acquired Snitow's trade show business. The Show moved to Chicago's new McCormick Lakeside exhibit hall in 1975. In February 2003, Reed Exhibitions announced that the National Hardware Show was moving to Las Vegas.
It would seem that your saw would be no older than 1945, but probably newer.
Mike