I will post if I have better pics.
No you can not see the flame throught the black stain, but you can clearly see the flames inside the F-holes where the wood is not finished.
You can notice the flame also in the pic i took for you showing the ES-150 sticker.
My guitar is in 1991 I have never see a mention of Cashew Finish so late.
It has a beautiful finish and really thin I have to say you can see at the edge of the F-holes that the black is missing at some places (pic with the sticker) and its not like a ding or a chip, its a very smooth and soft transition from the black to the non finished part