Heiko Sprint fountain pen | This is a fountain pen produced … | Flickr
Vintage German DDR FOUNTAIN Pen HEIKO primus - Etsy
office, office supplies, writing utilities, etui with Heiko cartridge pen typ 442 and ballpoint pen typ 570, made by VEB Füllhalterfabrik Form Heiko, Wernigerode, GDR, 1970s Stock Photo - Alamy
VINTAGE GERMANY GREY BALL POINT PEN "HEIKO" 542 - AliExpress
VINTAGE RARE GERMANY SET OF BALLPOINT PEN AND FOUNTAIN PEN HEIKO 1960/70s. # 628 | eBay