Mint link = https://en.numista.com/catalogue/mint.php?id=2918
At the time of posting mintmasters start from 1604 Wolf Albrecht.
Example coin with Gregor Bechstedt mark on top left between SAX and imperial orb - N#457778
Krauze 6th edition, page 841. Saxe-old-Weimar
I see Saxe-Weimar coins with flower mark before 1604. Maybe standard catalogue of german coins 1501 to present tells who or what that is.