Here are two completely different dealer boxes for the 140b/156 Rover 75 Saloon.
The yellow box is the traditional trade box and reasonably easy to acquire.
The grey, dual numbered trade pack, with the Hudson Dobson label for the USA is an altogether different proposition and very rare. I have never seen one before. I now need a nice boxed dual numbered Rover to go in it.
I can't part with my playworn 140b Rover as my grandson loves to play with it.