This vintage Japanese ceramic soup mug features a delicate floral and grass design in a contrasting white-on dark variable gray finish. This aesthetic is achieved through a pottery technique called sgraffito, where the top layer of slip or glaze is scratched away to reveal the contrasting color of the clay body underneath.

Based on its wide-rimmed shape and artistic nature-themed pattern, this piece is likely a vintage Otagiri soup mug from Japan

This is a beautiful piece with a natural vintage artisan vibe.