Released in 1910 with Gebr. Klingspor, Deutsche Schrift fett (extrabold) was Rudolf Koch’s first published typeface. Two lighter weights – mager (regular) and halbfett (bold) – as well as a schmal (condensed) and a peculiar schräg (oblique) were added later on. So was Deutsche Zierschrift, a related decorated cut. The generically named family (“German Type”, i.e. blackletter) also became known as Koch-Fraktur.
There are a number of digitizations, including versions by Delbanco (regular, bold, bold titling, decorative caps), Peter Wiegel, Lamatas un Slazdi, and Alter Littera (extrabold each). The most complete version seems to be the one by Gerhard Helzel, spanning at least 7 styles.