This is a Takahashi Leica M4. Takahashi was a Japanese painter and engraver well renowned in the 70′s and 80′s for his extremely highly detailed and precision repainting and engraving work. This particular M4 has been refinished with a crystalline stone fleck coating, known as ‘Jewelleryware Coating’ in Japan. According to Bellamy Hunt of Japan Camera Hunter, this is the last camera Takahashi painted before retiring.
It certainly is beautiful, although I’m not sure what you’d do with it other than putting it up on a shelf and admiring it, which seems to me a bit of a waste.