- entries to the competition to be limited to designs submitted by students attending the School of Art, or the branch schools;
- the designs to be suitable for reproduction, if desired, in enamel;
- the Bank to own sole rights to the design.
Britain's First Municipal Savings Bank relates what happened next:
A large number of designs were submitted, many showing marked initiative and ingenuity. The committee spent a considerable portion of one morning in examining and criticising the designs, and ultimately decided on the one submitted by Mr E G Barnes, which was duly registered.
His conception of a key with the simple but effective slogan "Security with Interest" appeared to meet the case. Little could he have thought that his design would be so prominently displayed and so well known as it is to-day. It explains in the simplest language what the Bank stands for. Other designs submitted had considerable merit, and were also accepted for propaganda purposes.
The externally affixed keys were removed from branches (possibly during the war?), but all branches came to have the design on their windows. It was also a feature of the internal decorations of the Bank's Head Office in Broad Street.
This information is courtesy of and taken directly off the Birmingham Municipal Bank website.