Here are the locations of the window fuses, at least for the 560, but the 420 should be the same. Window lifts are on fuses "C" and "D", located front row toward the inboard side. Should be 16 amp fuses (blue).
European (or German) fuses are the skinny ceramic, or plastic in modern construction, with the exposed metallic strip.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.