Seen similar from Milners, hobb’s, withers, and I think Whitfield but admittedly most were unnamed low end stuff- the Barrons patent box lock I have was off a similar unnamed box and I’ve also got a very nice precise milners box lock off one thats an incredibly fine pin gauge.
Seeing your second picture reminds me we had a boxfull of those brass fixing nuts and a couple of original 2-pin tools to fasten them, werent chatwoods though.
