Sealed QE II post box set into a wall on Allerton Road, Liverpool. No indication of serial number but the RM database I have cites <a href="//commons.wikimedia.org/wiki/File:Post_box_at_Yewtree_Road,_Allerton.jpg" title="File:Post box at Yewtree Road, Allerton.jpg">L18 317</a> as wall mounted, so my guess is that that is the replacement for this one.
<a href="//commons.wikimedia.org/wiki/User:Rodhullandemu" title="User:Rodhullandemu">Rodhullandemu</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>