Interesting. I only first used these ISO labels around 2011, so the two letter versions for Australia never hit me. However, having grown up in NSW, i can attes

Interesting. I only first used these ISO labels around 2011, so the two letter versions for Australia never hit me. However, having grown up in NSW, i can attest that it’s never been a two letter abbreviation in common language. Likely the standard was mass produced and “corrected” for ambiguity later, that’s my guess anyway.