OK, now I have some pics to add to this... last week I picked up a trinket set tray and pot, as mentioned it's one of my common unknowns, and the pot is seen with two different lid finials on the same pot/lid, and with two different trays.
I have bought a tray with finial pot version 2 (as usually seen as a set). I also have another tray which is usually seen with finial version 1. So, my thinking is that both pot versions are made by the same people. I also suspect that both trays are made by the same people, and this is where it gets interesting as my new tray has a label! It's the only one of these pattern pieces which I have seen labelled. The label reads: Century, Made in England
I'm adding pics of the labelled tray and the finial version 2 pot here, and will add the other tray and pot version 1 in the next post below.
Comments, additions, observations welcome, especially if you have copies of Century catalogues or adverts!!!