[Tagging] Cyphers on postal boxes

[Andy Mabbett]

We have

   royal_cypher=

for United Kingdom and Commonwealth postal boxes, but some in Ireland,
like the examples pictured at:

   https://commons.wikimedia.org/wiki/File:A_wallbox_SE_door.jpg

   https://commons.wikimedia.org/wiki/File:Irish_post_box.jpg

have a cypher or logo, that is not "royal"

Should we change the tag to:

   cypher=

or something else?

-- 
Andy Mabbett
@pigsonthewing
http://pigsonthewing.org.uk