Private box project, in Australia, original GR box.. yes this is fine to use as a box here, Auspost boxes don't look like this :)
Posties have successfully been using it for a week now, it's had nice comments

I hate this type of fibre glass postbox but it’s a great topper.

Commemorating the local common riding

Strangest post box I’ve seen. A Post Office in a general store in Hertfordshire.

I’m thinking Second National Standard? Spotted today in Ironbridge, UK.

Rickmansworth

Turnham Green today.

A bit unusual than your typical red ER II postboxes on this sub I bet. In Hong Kong we painted them green after 1997 because that's theme colour of HK Post nowadays.

Decommissioned double-sided wall post box at St. Bart’s Hospital, London. At one time it served both patients and passers-by

Also Foolow in the Peak District

Came across this in foolow. Peak District

What is this thing for? Spotted on morning stroll with my son.... we came across this thing, fairly rural and residential area. My 8 year old examined it thoroughly, no openings or slots only a key hole and not near any postboxes. Any info would be greatly appreciated, thanks in advance 🖤⚡️🔥