Jayne - I suspect Ivo is referring to older moulds from the late 19th century... but as he's on the board it's worth an ask for clarification. He doesn't read the trinket set forum though, so he would need a nudge to find out more from him.
With the Jules Lang RD no, my feeling still is that this is a set that originated in Czechoslovakia. The one in your post above is as you know a marriage (or, more properly, a menage-a-trois, as you have parts of 3 sets!), based I suspect on colour alone. One thing we don't tend to take into account when we consider these mix and match sets we find is that many of them have survived a world war, and some of the bits may have succumbed to that as well as normal day to day usage / accidents. Anything that survived in a household could be put together to make up a set, as many folks either didn't have the money to replace such items or simply didn't see the need to replace two- or three-part sets with a whole matching one, if the mixed set did the job for them. I think we need to consider the mindset of former generations when we wonder how these came about.
And that's without taking into account resellers who mix and match simply because the colour matches or it looks nice.
Also, and it's worth mentioning here simply because it's along the same sort of lines, Adam Dodds, who is a board member here, but also who worked for many years in the pressed glass industry in the north-east (Sowerby/Davidson/Jobling) has stated elsewhere that if a customer wanted a particular set making up it would be done, even if it wasn't a normal catalogue line. So, we may see what, to us looking at the catalogues now, appear to be mix and match from one glassmaker but might well be exactly how the customer wanted it to be. The customer was king then.
That doesn't explain this particular set, I know, but it's something worth bearing in mind as we try and solve some of these puzzles.