Burgess - understood, unfortunately the "correct" shot that shows the marking with the slide upper and lower boundaries is much smaller. Here is another shot with the slides matched, showing the relative size of the markings. Sorry for the fuzziness, it's just a result of the size of the original images.Scaling the marking is unfortunate, because that may be another inconsistency.
I am so glad you posted this from Gunbroker, saw that and could not believe how that spurious Navy marking has carried over from the HSc and now to the 1934. SAD One can easily see from the correct naval marking which has been pantographed and the other has been engraved. With the E/M on the left slide there is always a N property number on the front grip strap. I have never seen a Mauser 1934 E/M on the left side which does not have a N or a N with a number on the front grip strap. Another M-1934 commercial ruined for profit.