There are "legitimate" Death Head (Totenkopf) markings on K98s, particularly on WWI and post WWI Gewehr conversions for use in the SS. However, they usually also have additional markings to validate their authenticity. I've personally never seen a Death Head Luger but would agree that any anomaly like this (if original) would most likely be part of a WWI unit marking or even more remotely, an addition by the Freikorps.
Dale
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