On the left, stuffing box & lock nut. That I understand.
Then - though, the collar with the overlong grub screws (must find some shorter ones), clamps on the shaft. Either side of that, there's a pair of big washers with a ball race in between. I can clamp the collar towards the stuffing box so that the left hand trio have some function, or towards the fixed plate so the other set does - but can;t see a way that both have use. It is possible that the fixed plate it supposed to interact as a sort of bearing, but it can't necessarily support the shaft.
So I'm guessing in the past it has been assembled wrongly, or possibly has bits missing (or even extra, or at least unrequired bits). I'll leave it for now toward the stuffing box as a kind of extra grease water barrier, but all a bit of a mystery.
Blacking soon, so I've the opportunity to at least attempt to replace the stuffing, and try to make sense of the rest of it...
* well, there was no call for a gland pun, was there?