Non-serif to my eye, but I'm not an expert. I feel like the lume is receding a bit from the 3, 6, 9 markers, which makes it look like there are serifs, but when I blow up the photo, I don't really see serifs, just some exposed corners of the paint under the lume. The middle line of the "E" is clear.
Looks nice at fist glance, but insert is not original, as you probably know. It could cost you $2k or so for a nice one.
I'm sure you're already aware of this, but I'll just add this link here as a reference.
http://www.5513mattedial.com/Serifs.htmlClick to expand...