badge, trade, American, US Navy Machinist's Mate specialty mark
A black wool rectangle. Upon the black field is a white embroidered three-bladed ship's propeller, one blade pointing downwards.
The badge has no backing material.
The specialty mark was worn above the seaman's stripes or, in the case of petty officers and above, between the top chevron and the eagles talons on the rating badge.
Specialty in use from 1904 - current.