Rears of post boxes CH47 109 and 100, showing identical boxes with different manufacturers. 110 is on the left, and made by Lion Foundry. 109 is on the right, and made by Carronade Engineering Ltd.
<a href="//commons.wikimedia.org/wiki/User:Rodhullandemu" title="User:Rodhullandemu">Rodhullandemu</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>