Silver Account in Sumerian buying

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This administrative record from Sumer records an account of silver and other commodities written in Sumer using the early writing stage of the cuneiform writing system. The Early Dynastic III Period refers to the mid-3rd millennium BC and is known as the many burials in the Royal Tombs at Ur.
It was in the early stages of the Early Dynastic period that cuneiform began to more fully reflect the Sumerian language. In the early stages of the cuneiform system, around 3400-3000 BC, signs appear to have been used as mnemonic tools, but at the beginning of the Early Dynastic Period (circa 2900 BC), signs begin to reflect the grammatical and phonetic features of signs. Sumerian language. ( Source )
Güney Irak, Erken Hanedan III (c. MÖ 2500)

British museum.