New member needing help determining type of Hobbs lock please

[chubbbramah]

Or perhaps for fitting on a metal one

That was my first thought too; solicitors eg used many tinplate boxes of various patterns. But all I have seen had locks soldered on, not fixed with c/s screws. And many were block locks. These seem to have been used, but not soldered.

[tmorris]

Hi folks I have managed to open one of the locks and have taken four more photos for you to look at to see if this gives you any more info. My next question is would it be worth trying to obtain a key? Is this even possible?

Thanks again for all the help you've offered so far.

[chubbbramah]

Does look as though it could have been fixed to a metal case, though it's unusual.
Fitting a key so these is a straightforward matter, if you wish to have them in working order. And you are willing to pay for the time of someone willing to do this.