I was hoping you could shed some light on something for me, I recently acquired an unlimited Black Lotus, it passed the bend test, the water test and the light test. However when I examined it next to an Unlimited Mox Sapphire that I know is real, the dithering print appears slightly different.
It is much better to actually hold one in your hand than look at images, but I don't see anything that screams "fake" from my end. The wear makes me believe it to be real, but that's about it.
The thing that I'd suggest doing is to bring it to someone in your area that knows Vintage well, either that or go to a Vintage tournament. Get someone you can trust for a second opinion that can feel it and know it's fine by that. That'd probably be your best bet.
Looks real to me. The dark/light issues could just be exposure to sun, etc. Considering that it's an Unlimited one, that's incredibly hard to "fake" on its own. If you are still unsure, take it to the black light test. That'll work every time.