Esterbrook was a widespread, rather inexpensive fountain pen ("one-dollar pen") in the USA in the 1940s and 1950s, with easily exchangeable steel nibs; a real gold nib is a rarity, especially in Germany. Reliable information about the specific designation "14 / COLDIN" could not be obtained either via the specialist sites ramblingsnail.net or vintagepens.com/Esterbrook.shtml. Generally, gold designations are regulated country-specifically and not standardised throughout Europe. The Esterbrook is still regarded as a thoroughly solid everyday fountain pen even after 50 years.