Abstract: A lock pin for a badge shell having a round periphery and inwardly bent skirt along the periphery forming an open back, the lock pin being made of a length of resilient wire having a substantially straight fastening portion with a lower pointed end on the wire first free end to fasten the badge to a garment. The resilient wire includes a shell securing portion connected to the upper end of the fastening portion extending in a closed generally planar path around the fastening portion and terminating in the wire second free end comprising a locking tab extending outwardly from the plane for removably locking the second free end to the fastening portion upper end, the locking tab further adapted to bear against the inward side of the shell securing portion to resist removal of the lock pin from the badge shell. The shell securing portion has first and second arcuate segments conforming substantially to the curvature of the shell inner periphery and extending approximately 90.degree.