The following is a pic from Ludwig Borovnik's site, http://en.precision-rifle.com/ :



He's probably attaching his Ferlach assigned craftsman number but I think it gives insight as to how most of the marks were applied; one at a time. Although post WWII, I assume this to have been tradition and varied very little froma pre-WWII effort.

Kind Regards,

Raimey
rse