In his book "The H.J. Vol 2 page 94 Angolia mentions certain insignia used by officials of the N.P.E.A.. One of the items he mentions is for a Doorman or Pfortner, stating the insignia was a silver colored key worn 2 cm above the cuff on the right sleeve. Is there a mention of this insignia in any regulations, periodicals, or other sources? I've never seen an example of this insignia and as typical Angolia cites no reference for this insignia in his book.