Rashi on Exodus 25:39/רש"י על שמות כ״ה:ל״ט

1ככר זהב טהור OF A TALENT OF PURE GOLD [SHALL HE MAKE IT WITH ALL THESE VESSELS] — i. e. that its weight together with (את) all its vessels shall he exactly one talent, neither more nor less (cf. Menachot 88b). A common (not holy) kikkar (one used for weighing ordinary articles) was sixty manehs, that used for sacred purposes double as much, hundred and twenty manehs; a maneh was equal to a litra (the Roman libra, a pound) by which silver is weighed, according to the standard weight of Cologne. This is hundred denars which is the equivalent of twenty-five Sela’im, one Sela being four denars (cf. Bekhorot 5a).