An original 149 nib is today consistently executed in 18 carat and outside as well as inside yellow-gold with only a platinum-plated stripe in between. A nib on which only the outer edge is gold-coloured and the inner surface appears platinum-plated belongs, on smaller sizes, typically to a 146. There exist, however, older 149 nibs, presumably from the 1980s until before the Hemingway generation, on which the entire inner field was platinum-plated; with the Hemingway edition, a return was made to the variant with narrow edge. Accordingly, a large-area platinum-plated 149 nib can be genuine if it is at least about 15 years old.