Definitely not Series I, but looks like it is either a Signature setup (Vol/Pan/Filter/Filter) with an extra toggle switch for LEDs? Or, more likely, it's an Anniversary setup, which gives you a switch there by the input jack to choose between stereo/mono. I'm guessing that's an LED right by the input jack? I've seen that on other spoilers in the past, but not with this electronics setup.
I'm guessing someone updated the electronics to Anniversary and then left the LED there next to the input jack.
I love the top on it! Koa?