Early Stromberg

My Dad found this in his garage the other day and he wanted me to do some research on it. I found some info and it seems like it is a 1905 Stromberg Telephone. The Portable Combination H-B Telephone is the description I've been able to find. That is really all I know about it. I am trying to find out if this phone would be worth anything. We have two of the same make and model. One of them it looks like the cord is pretty beat up and the other looks like the receiver is missing a part. Any info would be great!

Thanks!