mastello [Italian]

(Plural, mastelli.) In Italy, a unit of liquid capacity, varying by locality. Also called a conzo or concia. The word also means "tub".

Locality	Definition	Liters
Bellune	(for wine) = 40 boccali	74.70
Ferrara	= 8 secchi = 40 boccali	55.38
Padua	= 72 bozze	71.30
Rome	= ½ soma = 10 cugnatelle = 40 bocali, also called a pello.	82.12
Rovigo	(for wine) = 108 bozze	104.80
Trente	also called the conzo	78
Treviso	also called the conzo, = 36 boccali à la campagne = 40 boccali de la ville	78
Udine	also called the conzo, = 64 boccali	79.30
Venice	also called a concia,	64.80
Vicenza	= 12 secchi = 120 bozze	113.90

Sources

Amphora 1 de malvasia da Venesia a mesura de bigonzo fano in Ferrara mastelli 11 sechi 3.

One anfora of malvasia of Venice measured in biconcia makes in Ferrara 11 mastelli 3 secchi.

Bartolommeo di Pasi.
Tariffa de' pesi e mesure con gratia et privilegio.
Venice: 1503.
as quoted in Elder.