All I know is that the marks are all impressed (using a carved stamp before drying/firing.) The body is porcelain -- I can't tell the quality, but it doesn't matter if it's not a translucent piece. And the glaze is celadon. Looks like a souvenir from a holy site, but the alphabet (if it is writing above the cross) is not familiar to me. It's maybe an interpretive (βαsταяdizεd) take on ancient Greek, but beyond that, I have no idea.
My bet is it's a modern Christian tchotcke from the area near a significant monastery or other place of Christian religious importance.
Best of luck, hope this helps!
