D. Leonardt & Co, steel pen nibs https://kallipos.de/d-leonardt-und-co-en.html
A collection of antique calligraphy steel pen nibs, produced by the manufacturer D. Leonardt & Co from Birmingham, England
Nov. 1883 T.W.R.C.C slip fine No. 010 EF, Neue Correspondenz Feder, Küll – Leonardt