Here is the data from the Russian Wikipedia (translated into English):
Pud is an obsolete unit of measure for the mass of the Russian system of measures. Since 1899, one pound is equal to 16.3804964 kg.
1 pood = 40 pounds = 1280 lots = 3840 spools = 368 640 shares.
10 pounds = 1 Berkovets.
Berkovets -- from the old Russian name of the ancient Swedish trading town of Björkö -- the old Russian unit of mass.
Berkovets = 10 pounds ≈ 164 kg.
The weight measure "berkovets" was originally used primarily for weighing wax. Mentioned in the charter of Novgorod prince Vsevolod Mstislavich, this community of the “Ivanovo hundred hundred” merchants, who sold wax and honey in the transfer of the Church of St. John the Forerunner on Petryatin to the courtyard in Novgorod in 1134.
Subsequently found in Novgorod and Pskov chronicles.
With best wishes, Olga
You don't have to pay for it. In return, I will ask you to decipher for me the text is in Swedish. I have many ancestors in Finland and I need help in reading old texts in Swedish. We can do a barter.