This font contains a bunch of useful ligatures, and by typing 'N', 'r' 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.
Font Family: Bernhard Blackletter
Tags: 1920s, ads, bernhard, black, blackletter, extrabold, fat, fraktur, german, headlines, long s, posters, vintage