A look at London's post boxes from Queen Victoria to Queen

A brief history of London’s post boxes and how you can tell their age, including when you can expect to see King Charles III’s cypher on them.

Royal Cypher Spotting with Victoria & Etta – Victoria Eggs

Where to find post box toppers in the UK

Queen Victoria's postbox unearthed in Surrey cottage - BBC News

The Green and the Red

Victoria Biography, Family Tree, Children, Successor, & Facts

Royal Mail Post Boxes, British Post Boxes

Queen Victoria's handwriting - Untold lives blog

Queen victoria post box hi-res stock photography and images - Alamy

People are only just finding out what the symbols 'GR' and 'ER' on postboxes mean

Postboxes of Enfield - Enfield Dispatch