Old avatars, guilds long ago could have flags to represent them. Im not sure much more about these, i wasnt around gunbound then.

These are some updated Pictures of many of the Guild Flags. To this day these old Guild flags remain some of the most "Rare" avatar items available. Recently a person close to me was asked by a GM to pick one avatar she would like for helping that GM. There were a few exceptions so she chose another guild flag, however the GM told her that here original choice of the "nell" flag was not available.

So after many years it seems some of the original guild flags are no longer available anymore, the pictured above are the current Guild flags that are still around. This is news from Softnyx's GBWC server.