I think if it’s still straight and the knurl is still there then it is worth about as much as you paid for it because it still does what you bought it for. On the other hand, it’s worth what someone will give you for it.
I own a b&r 1.0 and a 2.0 and like the 1.0 best because it doesn’t have those silly clips holding it together.
what are you going to replace it with?