Cheltham Building society - 1951.

I like the art work!

Context for those outside Britain, or other countries that do this.

https://en.wikipedia.org/wiki/Building_society

A building society in 1951 Britain was a mutual, not-for-profit financial institution that accepted savings from its members and lent money primarily as mortgages for home purchase. They were governed by building-society legislation and registered with the Registrar of Friendly Societies.