Thannhaeuser’s mid-1930s display blackletter font as a fresh and extended redesign called Staufer Gotisch. This font contains a bunch of useful ligatures, and by typing ‘N’, ‘r’ and period or ‘N’, ‘o’ and period plus activating the discretionary ligatures you get an oldstyle numbersign. As usual in my blackletter fonts, the # key is occupied by the ‘round’ s.