These bayonets are not engraved but etched, i assume it was firstly realised in early 70ies by Bayoking to increase value of the S84/98 missmatched bayonets. There was from BCN time a short website to warning about similar bayonets, anyway the late 90ies are more problematic as copied some etch motives and floral motives from dress KS98 bayonets.