Recently, forgeries made with quality laser printing have appeared. Both, the basic stamp, as well as the overprint, are forged. Plain medium-sized office paper is used, and usually, there is no gum. If you have such forgery in your hands, it is not dangerous because you can immediately see from the paper what it is about. But it is a much bigger problem if you see only the front image (e.g. on the online store) because the reproduction is pretty credible even under the scan of usual resolution.
Genuine on the left, forgery on the right. At this resolution, the forgery seems quite credible.
Genuine on the left, forgery on the right. The high-resolution scan (4800 DPI) clearly shows the dot structure of the laser printer.
For other types of forgeries of the Banja Luka issue, see my article in Acta Philatelica Nova 2017.
