We generally try not to "appraise" bows here. The value of a bow is very subjective and is dependant on a lot of factors. here is no "book value" on any bow.
The rule of thumb is that it is worth what someone will pay, no more - no less.
Your best bet is to go to the auction site we must no name and search under completed items. However, thos bows sold there may not be in as good shape as the one you are considering.
Herters bows are worth more to real Herters enthusiest than to other collectors. That is personal. Herters bows are generally great shooters, but not high on most collectors list. Now, this statement might get me skewered but a Farbenglas shaft. but I think it is accurate.
Your question should not be "what is the bow worth", rather "what is the bow worth to you". Figure that out and you will have your answer.
Buy it. Shoot it. Enjoy it.