FELSA 4020BrandFELSACaliber4020Size7 3/4FunctionVersionHands0,60x1,20Stem5028Stem (subs.)Stem (2 pce)Balance staff23202/23204Balance staff (subs.)25501/25111Mainspring (subs.)1,25x6,50x0,07Mainspring (subs.)BatteryWatchpartsPart NocaliberdescriptionoriginalArtno.180BBarrel with drum + cover920001804020200BCenter wheel + cannon pinion920002004020401Winding stem8025028407Bclutch wheel920004074020410BWinding pignon920004104020420BCrown wheel920004204020445BSetting lever spring920004454020723Balance staff, pivoted80225501723Balance staff ST -shock-absorber80223202