Kamień

stone; an Old Polish unit of measurement equal to 12.96 kg. In the Anglo-Saxon measurement system, 1 stone equalled to 14 lbs, or 6.3 kg. In court bills, it appears as weight unit for sugar, coffee, and other dry products.

 Source:

“5 stones of the finest Dutch coffee … 120 zł, 5 heads of the finest kandisbrot sugar, 1 stone and 15 pounds …32.15.” AGAD, AR XI, ref. no. 232, p. 8, in Gdańsk, May 28, 1755, Receipt taken for errands…

“For 1 stone of Martinican coffee [from Martinique] for the confectionery, 64 zł.” AGAD, Archiwum Branickich z Białegostoku, ref. no. 15, p. 17, Regestr ekspensy miesięcznej przez cały rok 1791 r.

 See also: B. Popiołek, Między kuchnią i spiżarnią. Magnackie regestry wydatków kuchennych w osiemnastowiecznej Rzeczypospolitej, Warszawa 2025.