"Touched to the Holy shirt" (hl = heiligen = holy).
Maybe the pin was touched to the holy relic shirt of Trier, like consecrating a banner, or it is more symbolic, like "touched by an Angel". I suspect it might have actually been brought into contact with the relic in the Catholic tradition of touching holy objects.
Cheers,
Stephen Gold Party Pin Website: http://pages.interlog.com/~sjl/GPB