This Yad Vashem link and the photo has absolutely nothing to do with pottery or ceramics. Yad Vashem is the Jewish Holocaust museum in Jerusalem. The literal translation of Yad Vashem is “arm and name” – which is linked to Jews being tattooed with a number on their arms and thereby “losing” their name and identity. The girl in the photo was possibly a victim or survivor of the holocaust.
Please take a look at image [b]mv01[/b], that’s a legit ‘YV’ version used by [i]Müller[/i] from [i]Volkstedt[/i] (here including the matching genuine item number). It’s ‘Y’ (instead of an ‘M’) form comes from an unlucky print, just like the ‘V’ often looks more like a ‘Z’:
Image [b]mv02[/b] shows a legit ‘MV’ used from 1930 up to the factory re-location in 1962. This is the most common German mark type found:
Image [b]mv03[/b] on the other hand shows a mark type I dubbed the ‘crazy kid’ version as it looks as if some small kid made it. Even the writing does not appear “naturally written” but rather copied line-by-line from a note.
All of these basic types do not match the “style” of the mark included on OPs piece, therefore I doubt the figure is a genuine [i]Müller, Volkstedt[/i] or [i]Johanna Saar, Seedorf.[/i] item. It could (with both eyes near closed) be pushed into the direction of the later [i]Saar[/i] kitsch editions made in Dromcolliher (Dromcollogher to the locals), Ireland. But seeing the style differences that would be really hard to believe.