Gothamburg is a blackletter or square gothic face. The shapes of many of the letters were inspired by sets of letters in Oscar Ogg's The 26 Letters (Thomas Y. Crowell Company, 1963, 1948) illustrating the gothic style of the middle ages.
The Plain and Thin versions differ not just in pen width, but also in pen angle. The Thin version has less contrast between the thin and thick strokes.
Today medieval styles are used only for display. Their fall from favor is unfortunate because these styles have tremendous character and there are so many interesting variations that are possible.
