It seems that the .6 coil is designed for the veco and is rated for higher wattage if you beleive fasttech, it would be strange that it they aren't authentic as they are pricier, I also just saw that the veco have a .3 coil on heaven gift so it made my wonder if these are cross-compatible?Hmmm, that must be a knockoff coil. I know it says "authentic" but fasttech sells a lot of knockoffs and calls them authentic. Here is the link to the EUC coil page at vaporesso. EUC Vape Coils - Vaporesso
There really wouldn't be much of a point of selling a .5 ohm and .6 ohm coil in the same material as there are normal variations in each coil anyway. My current coil reads .46 ohms but the last one was .53 ohms.
I hope you do get the Veco tank and will let us know how you like it. I am definitely considering getting one as well, especially since I can get it in 4 ml size!
Also where can you get the veco in 4ml? I would be interested in that