A control number unique to an object, used to identify it among the other objects in that collection. It is part of the numbering system encompassing the permanent collection of an individual or an institution, and reflects the transaction making an object a part of that collection. An accession number is assigned based on the order in which it was acquired, not on its kind, and typically consists of the year of accession and the serial number within that year. Also see catalogue number and museum.
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