I think the #Fremantle History Centre's photographic catalogue is now up to five identifiers. Of course, old URLs have been broken, the catalogue doesn't actually mention the one ID number that does now work in the new URL, and the 'reference number' that people mostly cite is not something that you can link with.
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@samwilson looks like people didn't have enough technical skills when they were moving systems.
@dean I wonder if they ever asked if it was possible though!