I have to admit that information on Hero, both products and company, is rather spotty in the English language web. In the Chinese language side it is just as bad!
I think the major problem is the lack of interest among the Chinese enthusiasts in spending efforts to do research and documentation; WWII and the civil war certainly did not help with getting contemporary information, be it first- or second-hand.
On the other hand the extant Japanese makers are more proud of their traditions and information are easier to find.
There are plenty of sources for Chinese pens online, but for Hero pens - at least the most popular ones - there's the additional risk of coming across counterfeits. Buy the seller, not the products, as we say: even if you have to pay a little more, it is still better than spending any money at all on an unsatisfactory forgery. With more experience you might venture into Taobao, where some rarities can be found too.
Good luck with your quest!
P.S. I have been collecting Chinese-made pens for quite some time and use them regularly, mostly concentrating on Parkeresque hooded-nib ones. But if I could start afresh, there's a good chance for me to focus on one brand only: William K. Rockman, AKA Guanleming; in general pens under this brand through the many changes of ownership tend to be a bit better than average, and without a significant price penalty, if at all. Tracking down an example built by them during their earliest days in NYC in the mid 1920s could well be a life mission!
Edited by Seele, 23 May 2016 - 14:36.
No, I am not going to list my pens here.