Is the CDI 12v? [pic]

I have had a big clear up of the garage over the last couple of days, during which I've been trying to sort out spares for Davos. I happened upon this CDI which I know I have used in the past. Logic tells me this is a 12v Ducati which is exactly want I want as a spare.
But, somewhere in the back of my mind, I'm thinking I last used this many years ago on a 6v set up.
How can you tell please?

But, somewhere in the back of my mind, I'm thinking I last used this many years ago on a 6v set up.
How can you tell please?