Ooohh what a fab colour that is! And one not often seen... I have one piece that colour (different pattern, same colour, unknown maker) and have seen a set by Davidson in that colour too... and yes, I think we need to search the catalogues again for your preserve/mustard pot and see what we can find. Well found! 
The mustard pot has been found!
Some time ago, I saw trio cruet sets of salt pepper and mustard pot in green and blue glass on a matching tray with bakelite lids to the salt and pepper, the same as my mustard but no catalogue image found, although Czech suspected.
Now here they are along with my Amber one (Topaz) in the Jewelray section of the c.1950's Clayton Mayers catalogue, right at the bottom page 97-107.
http://www.victorianpressedglass.com/pdf/clayton_mayers.pdfIt's worth noting the Jewelray Mustard and Butter Dish (Honey) which I happen to have one of also, have no star pattern in the base, the same as the trinket pots in the set that was Mystery 47.
I believe the "Variant" trays above with an all over star base come with pots with all over star bases.
The topic on the Butter "Honey Dish" or "Amber dish with attached saucer" pretty much identified as Stolzle Hermanova is here:
https://www.glassmessages.com/index.php/topic,48082.0.htmlIn summary, it seems the only piece the same in the all over star base tray Trinket Set and Jewelray Trinket Set is possibly the ring holder and the size of the tray/pots.
Also Hermanova seems to be likely as the maker.
GTS Link to Jewelray Trinket Set images and photos:
https://www.glasstrinketsets.com/cms3/unknowns/jewelray