Is this legit?

[A.Sharp]

My gf was given this watch some time ago as a present. She was told it was vintage. The band seems to be a replacement, but I cant tell if the watch itself is legit. There is deep scratching on the "crystal", making me believe it's plastic, but could this just be characteristic of an old vintage piece? would they ever say both rolex and tudor on the same watch? its a mid sized watch <36mm.

Thanks,

-A.Sharp

ps. its a pretty cool watch either way.