Kassnar Concorde 0.22LR


This box has OA underlined by a single line, but Municion.org shows OA with lines above and below OA. Any meaning to these lines? Is this correct that Kassnar Co.has closed in 1989?
Lastly, OA is not on the headstamp reference list of IAA website.



According to the .22 Box Identification Guide http://22box-id.com/world.php, the PDF on Argentina .22 boxes http://22box-id.com/world/Argentina.pdf :

ORBEA ARGENTINA S.A.I.C. produced .22’s with three different variations (with and without lines) of the OA headstamp. The reason for the lines or lack thereof is not given (that I could find).