JanetheWriterHey @JanetheWriter -- Good question, here's a partial list of pen brands to reference:
YES - Int'l Standard: Caran d'Ache, Faber-Castell, OHTO, Kaweco, Pelikan, Schneider, Waterman.
NO - Proprietary/Other: Cross, LAMY, Parker, Pilot, Sheaffer, Platinum.