I wouldn't think Auguste Jean - I could be wrong but there's something I notice on his pieces not on these

I think the different coloured trails might have indicated Harrach. I think there's been a Harrach piece on here before with different coloured trails.
However, the red/purple trailed rim is unusual, or rather I've not seen it before, and the enamelling ... I did think Theresienthal at first so agree with you they might be worth looking at but I wouldn't have thought they made the vases.
Can we see another photograph close up of the enamelling please? if you have time. Many thanks.
And if you search Auguste Jean on the board, there should be a few threads with further details and photographs to browse.
m