[Source - Nessa Leibhammer for FHYA, 2012, using MAA materials: There were separate Ethnographical and Archaeological accession registers which ran concurrently from 1884 - 1917, with the ethnographic accessions numbered using the following format: ‘E’ and then ‘year accessioned’ followed by sequential numbering, e.g. E 1912.123. A single register was used from 1917 with no letter prefix, using the format of 'year accessioned' followed by sequential numbering. The Museum’s second curator Louis Clarke instigated a Z Register in January 1923, accessioning and entering objects that had not been recorded in the year of acquisition or that needed to be renumbered. These items were given Z numbers, using a ‘Z’ prefix and then sequential numbers, e.g. Z 1234. This numbering system for un-accessioned items found in the museum continued along side the normal accessioning procedure, using the relevant year of entry, until the late 1990s.]