Universal fitment 5/8inch BSP replacement headworks, commonly found in older tapware, with 12mm jumper valve, washer diameter approx 20mm.
These are rising headworks (meaning the handle moves down as handle is turned to off/closed, and moves up as handle is turned to on/open). With flat sided handle stem (not splined). Most tapware now use smaller 1/2inch BSP headworks, see Foreno Non Rising headworks FORPT65
For replacement 20mm washer to suit 12mm Jumper valve use FORPT09