I need help recognising these particular lock parts...

[Huw Eastwood]

Almost, you got 6 and 8 right but what you've pointed to at 7 is one of the Hooks.

The Lath of the bolt is the tail or bottom end where it's thinned down around the Talon. So the Lath on that lock would probably be most of what's south of number 6.

[lorddlm2]

Ahh, ok I understand now!!

So the two hooks would engage with what I have always referred to as a link plate (not in the photo) in order to lock the box. However, is 'link plate' a correct term?

Sorry for all the questions, but I am very interested in learning all this.

[Huw Eastwood]

Yes pretty sure link plate is right and not strike plate or staple for a box lock.

I'm probably wrong calling the bolt projections hooks thinking about it, the bolt slides or jumps on a box lock and doesn't pivot in an arc so not a true hook as on a hook bolt lock, which does.

Your lock looks similar to a Barron's in that the gatings and stumps (there's another one for you) are reversed between the levers and bolt.
BTW, the angle along the top edge is the Salvage, and any wards with a 90 degree bend are Hook Wards, anyway that's it I'm off now as it's Saturday and it's well past beer o'clock

[lorddlm2]

Once again Huw, this has been incredibly helpful and I thank you so much.

[robotgoldfish]

The part vertical mounted part identified as a tumbler can't be a tumbler. It has no gate to interact with. It looks like it acts on the bolt pushing it into the locked position. It also looks like it would retain the key if unlocked. Was this off a cash box of some kind?

RG