1 mm “fine thread”. Old, larger diameter knob for the Faema Express, Special and No Stop models. Also fits the Victoria Arduino Athena Leva model.
1 mm thread pitch means that these have threads on the inside that measure 1 millimeter from thread peak to thread peak, referred to as “fine” thread. These work with any valve that uses the F_475 valve fitting.
These look very similar to the La Marzocco MZ_11 knob, but the Marzocco use a 2 mm thread version.
