Holton tenor

Hello
I am from Denmark, so sorry if my language is a bit unclear
I have an old Holton tenor saxophone, it's made in Japan and similar in its structure much of a Vito and an early model of Yamaha. Is it a stencil produced by Yamaha for the American market? The saxophone is in very good condition, slightly tarnished, but has a big and beautiful sound. Is there anyone who can help me with the age and value of the saxophone ?
Thanks
Osper