I have alot of plain ol' Acer p. and none that look like this beauty. I looked for it and the closest I can see is Dr Tilt. Ok, I'll fess up, I have a book, not a bonsai book, a maple book, specificly Japanese and not just Acer p. all of them.
Japanese Maples- The complete Guide to Selection and Cultivation by J D Vertrees and Peter Gregory. Includes over 600 plants and I just love paging through it and reading the descriptions of all the different varieties. I looked at Glowing Embers and it's a much redder leafed tree. Take a look at Dr Tilt and see what you think.