You may have seen street signs, covers or other street furniture with markings like 'C1' or 'SW5' on them around Melbourne. What are these and what do they mean?

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MORE INFORMATION

My website: https://philipmallis.com

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I acknowledge the traditional owners of the lands on which this video was filmed, the Wurundjeri Woi Wurrung and Bunurong people. I pay respects to Elders past, present and emerging, and their extensive and continuing connection to land, water and country.
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SOURCES

Hollick, Ruth, 'Small girl and postman outside gate'. ca.1910. State Library of Victoria. http://handle.slv.vic.gov.au/10381/32667

'Postal Areas'. Australia Bureau of Statistics. 2016. Accessed via National Map. https://nationalmap.gov.au/

'Melbourne city 1920s'. Australian Centre for the Moving Image. ca.1920s.    • Melbourne city 1920s  

"DISTRICT POSTAL INDEX." The Argus (Melbourne, Vic. : 1848 - 1957) 27 October 1922: 11. Web. 5 Apr 2023 http://nla.gov.au/nla.news-article185....

"POSTAL DISTRICTS." Camperdown Chronicle (Vic. : 1875 - 1954) 17 November 1923: 5. Web. 5 Apr 2023 http://nla.gov.au/nla.news-article652....

'Melbourne & suburban postal districts'. 1927. State Library of Victoria. http://handle.slv.vic.gov.au/10381/11...

'Postal district numbers of Melbourne. Wikipedia. https://en.wikipedia.org/wiki/Postal_...

'Melbourne metropolitan postal district system : street directory showing the relative postal district numbers', Australian Postmaster-General's Department. 1936. State Library of Victoria. http://handle.slv.vic.gov.au/10381/11...