Silver German marks unidentified 12 W TK

[Fakir]

Hello,
I'm facing these marks on a silver piece that says 12 and below W (which is probably the city) and in a rectangle TK.
Does anyone know these marks ? Which city could it be ? What time ? I have seen in Rosenberg that W and below 12 could be Wertheim in the Baden region but here the order is reversed.

[silverfan]

Probably Windsheim or Wollin around 1850; TK not yet identified.
Regards silverfan