That’s an interesting box Ian and a real shame it’s in such poor condition. It looks like there’s no cylinder at all from the picture, and like others said that door is almost definitely fused to the body with rust.
Interesting for me as it possibly solves a mystery- had this S Mordan cylinder and key for over 50 years and never been able to really match any definite container to it.
When you say theres loads of Mordan info on the net I’m guessing it’s about his silverware and gold products- pencils, snuff boxes etc etc? I’ve never managed to trawl up anything of real value on his locks, although there is plenty of his history covered, with reference to his early years with Bramah. No doubt his locks are far rarer than his silver and gold pencils for which he is far more famous. His locks though are pretty much regarded as equal on terms of quality and precision as bramah’s- this one certainly is on par. He followed on the design but certainly didn’t cut any corners like most of those old makers that copied something else.
Hope someone can post pics of a complete chest in original condition as I’d love to see one, but I think it’s going to be a tall order. The odd bureau and writing slope turns up but never see much else.

