Both my new books are now here.
I'm having a great difficulty 'sorting' out who did what for a number of reasons:
a) online attributions are not always what I would attribute them as having looked at the books and the references - it seems as though sometimes a name (Franz Zach mostly) has just been plucked out the air and used as a reference rather than really looking at the comparisons of the piece to the ones id'd in the books.
b) it would help greatly to have all of them lined up in front of me (online and those in the books) to compare - it's one of those instances where seeing the item in the flesh would be helpful because of the subtle differences in the engraving techniques.
c) the printing in the books, 'smoothes' out the nuances of the engraving making it difficult to see detail in some instances and rather irritatingly, the books only give one view, the front, of the piece and no base shot either (my particularly bug bear with buying books - authors please note, it's really helpful to include base shots!)
d) I'm trying to compare double overlay cameo v single overlay cameo and the effect is definitely not quite the same so you have to look harder at the engraving technique and the shapes of the cameo vines for example to spot similarities.
An example of the difficulty being that I think it's possible the engraver of my piece was the same as this one herehttp://www.auktion-bergmann.de/ufItemInfo.aspx?a_id=78&i_id=209674&s_id=6104
However... that linked piece is attributed to Franz Zach and I think it might be Karl Pfohl
to me it as similarities with plate 111.76 stangenpokal mit Berber und Lowin and the blank and foot of the piece with plate 111.80 of Das Bohmische Glas band III
There are no pictures at all in any of the books (of which I now have a goodly clutch), of triple layer cameo such as my vine and grapes or the stein, becher and tazza linked to on this thread.
There are two Karl Pfohl pieces done on triple layer blue over white over clear in Das Bohmische Glas Band III, they are 'medallion portraits' with no foliage unfortunately. There are no Franz Zach pieces.9
There is one more potential name to add to this list - in Das Bohmische Glas band II page 69, there is a tall goblet attributed to Anton Heinrich Pfeiffer. 111.77