It's pretty similar to Maiandra, but I'm still looking.

It's also rather like Tempus Sans SC.

Still Looking.

Skia is also similar

Went all the way through Part 6 of the Script Font ID Guide, and those two were the closest I saw.

I give up for now.

That S is a dead ringer for ITC Tempus, if you heavy it up a bit. The overall shape and even the little bumps and lumps match. I'd say there's a good chance that that's what this is, with some modifications (mainly to the D and the U).