The standard consists of 16 weights. The heaviest one is a cone-shaped box, with a lid and a tri-lobed handle and two armillary spheres on the hinges. It has two horizontal friezes containing inscriptions, one near the rim and the other near the base; there are 2 inscriptions between the friezes, on stripes, one on each side. The lock is shaped like a dog.
On the top cover are visible 2 shields with the Coat of Arms of Portugal and 2 insignias of the Brotherhood of St. Eloy.
Inscriptions on the friezes:
(King Manuel the first of Portugal, the highest and excelent King)
(Had me done in the year of our Lord Jesus Christ of 1499)
Inscriptions on the stripes:
“FOI COMSERTADO ESTE MARCO EM LXA”
(This standard was fixed in Lisbon)
“NO ANNO DE 1770”
(In the year of 1770)