Additional information to supplement Mech's post.
In the classic era, various pen design specifications were given type numbers. For instance, a small affordable pen meant for students was 50, a larger size pen like this was 28, one size smaller was 26, an extra large pen is 90, etc. Do note that the type number refers to the general specifications rather than design details such as filling mechanism and such.
Therefore, numerous pen manufacturers produced pens to these specifications, and they often just named them as such; Golden Star for instance, I also have a Heilongjiang 28 in an early group buy and it's interesting to compare them; they sure differ in many details but it's clear that they are the same in spirit.
As Mech said, after Golden Star's closure Hero acquired the firm's assets, including designs, and restarted production of several models, such as the 565. This 856 is indeed a recommencement of production of the final model of the Golden Star 28 under the Hero name; I have an example as well. The most obvious changes is the replacement of the black collar by a clear one that works as an ink window, but a new clip and Hero-made - and branded nib - are fitted as well, so it is indeed a Type 28 in all but name.
Originally a lot of Chinese pens were celluloid button fillers, and that applied also to the earliest Shanghai-built (with KSPC code) Golden Star 28, and perhaps Beijing-build ones (with GSPC code). It was much later that Golden Star switched to injection moulded thermoplastics and a simpler bulb filler, and that's carried over to the current Hero 856.
Hope this is of some interest.
No, I am not going to list my pens here.