Eire 48

[PingSpike]

@rustybarnet

What’s the meaning of the 48 out of interest?

Andy, have a look here over here mate

@Acedrone

The signs were meant to identify the land for pilots crossing above it—Éire is the name of the country in the Irish language. Each one was numbered, too, and they became navigational aids for British pilots. (Though officially neutral, in practice, Ireland favoured the Allies.)

Eire Neutrality Markings 1942- 1943 - Google My Maps

And re 48 specifically:

http://eiremarkings.org/black-head/