1667, GR

[RoderykWLK]

The date 1667 and the Prussian contribution from 1809 are engraved.
Request to identify the goldsmith

[Theoderich]

The date 1667 and the Prussian contribution from 1809 are engraved.
Request to identify the goldsmith

It is interesting, but without a hallmark it is like looking for a needle in a pile of straw.
Can you make better images of all marks?

[RoderykWLK]

Unfortunately, there is only a monogram from the photo. There is no city sign. The date is engraved

[Theoderich]

Unfortunately, there is only a monogram from the photo. There is no city sign. The date is engraved

but You write:
"the Prussian contribution from 1809 are engraved."

There are so many variants of this mark, so this mark could helpful to find the area.

[RoderykWLK]

I'll send a photo of the sign on Friday.

[RoderykWLK]

eagle

[Theoderich]

eagle

my gess it is east pruzzia ... probably Königsberg

there was a maker Georg Reimer with a similar GR-Mark, but in a "Zweipass" (two cycles)
born 1628 mention 1663 ... +1689