Although most Diamond brand traps do not have a lot of value, they are collector items. I have mine dyed and waxed and put away in boxes. Maybe in 100 years they will be worth something :-)
The "Diamond" brand traps were made by Norwich Wire Works, Inc., Norwich, N Y from 1923 - 1931.
Nancy at Wiss Miss Enterprises has a few for sale. You can get an idea of their values from her website.