this gothic script has a lot to answer for

However, back to the valuable contribution from Pamela, for which grateful thanks. There has been an interval of several years since the exchange of communications between Jane Spillman and Herr Geiselberger, although since Pamela doesn't add anything more to what we can read, we must assume matters currently remain as discussed in 2006. With regard to pressed glass, all these people are vastly more knowedgable than me, and so the following comments are really just my thinking out loud in an effort to understand what has been researched so far (and my mis-understanding possibly).
It appears to be agreed that Schiedt were wholesalers/importers selling French/American/English and German glass and certainly active in the latter part of the 1880's, although exactly when they started or ceased trading is less clear.
With regard to the platters that were the subject to the GMB threads, Mrs. Spillman comments in the Press-Korrespondenz article that ............."(the catalogue) also has two bread platters with German inscriptions
which are identical to some with English inscriptions made at the Wear Flint Glass Works in Sunderland and I'm inclined to feel that these are English and not German".
Although it's not clear (at least to me), I'm assuming that Mrs. Spillman's last comment refers to her consideration that it's the German inscription examples that she 'feels' were English and not German. I'd thought initially that she'd been commenting about those with an English text, but having re-read her words, now believe I was wrong, and that my second thought was correct. After all, the article states without doubt that English worded platters were made in England - so I'm assuming the lady is speaking of the German worded pieces.
If my understanding of this is wrong, I hope that somebody will put me right very quickly. Is there any/much precedence for the manufacture of glass articles with wording, by one country for another, when there is a language difference? I really don't know.
Unfortunatley, from the point of view of our English interest, Mrs. Spillman omits any source of provenance for the 'English inscription examples, which she says were made by the Wear Flint Glass Works. I'm thinking here of a source of provenance from the literature.
According to Raymond Slack, Henry Greener (he of Henry Greener & Co.) in partnership with James Angus, took over a business in Trimdon Street (Sunderland) known as the Wear Flint Glass Works, in 1858 - which I'm assuming is the same company of which Mrs. Spillman speaks. This venture lasted a little less than 12 years - and from its inception in 1858 until its demise in 1869 it was re-named and traded as Angus & Greener. This comment is just to make the point that the Wear Flint Glass Works seems to have ceased as a trading company in 1858 - so any wares made genuinely by them would have been produced prior to 1858, although I guess that Angus & Greener might easily have continued to use earlier moulds after 1858 (my speculation only, of course). In view of the known approximate dates of Schiedt's catalogues, and the genuine trading dates of Wear Flint Glass Works - there seems a possible potential problem with overlap.
Apparently, there was another factory across the road, and which went under the name of the 'Wear Glass Works', and seems to have been active from something like 1837 to 1896, owned by James and John Hartley.
So, the bottom line might be...........all of these platters, with English and German text, were made in the U.K. in Sunderland. It would be of interest to know the source of Mrs. Spillman's provenance for Sunderland, as unfortunately it seems that all known examples are unmarked.
Without looking in Thompson, I can't remember whether there are recorded examples of items manufactured by the Wear Flint Glass Works which do in fact carry registration diamonds, or whether all of that factory's wares were unmarked.
Please feel free to comment, whether good or bad - I'm just airing thoughts.

Ref. 'English Pressed Glass 1830 - 1900' - Raymond Slack - 1987