The side-panel mark looks like similar markings I have seen in photograph, engraved into the surface by a rotary pantograph. Note the regularity of the line widths, and that all the line ends are rounded. There should be characteristic rotary-tool "swirls" within the lines. Do the grip strap markings apear to have been made the same way?
Reportedly, most of the Nazi Kriegsmarine markings were applied in this manner.
--Dwight
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