This rank chevron is quite interesting. An early piece from the Reichsmarine or possible earlier. It has been upgraded to Hauptgefreitor as result of a promotion. It is cut noticeably larger than the typical 3rd Reich era rank insignia. Back cloth is a dark blue. The chevron braids have a nice patina, particularly the two stripes that were original to the factory piece before the promotion upgrade.
Hauptgefreitor Chevron; Reichsmarine or earlier