samsonlonghair, it would seem a bit ridiculous of Orochimaru to give Danzou the Sharingan without a justifiable reason (unless in a long term run, it benefited more to Orochimaru than Danzou). If this Sharingan is only one of Orochimaru's horribly designed copy of the unfathomable Sharingan like those Chinese manufactured name-brand knockoffs, it seems questionable why Orochimaru would give Danzou those eyes instead of giving it to himself.

Truly, Orochimaru has longed for the Sharingan because he sought one of the greatest powers in the Naruto universe. It is unlikely that Orochimaru would be experimenting on Danzou given his [Danzou's] status. Plus, it is in Orochimaru's psychotic nature to perform experiments on himself - he even turned himself into a snake!

However, my argument is only based on speculation and extraploating analysis, so we will have to see in the next chapter of the origins and whereabouts of Danzou's Sharingan.