Von Schweikert VR-4 JR & VR-4 JR MK II

How to distinguish between VR-4 Jr. & VR-4 Jr MK II?
Is there any way sign on the back?

If you look at the bass drivers you can tell right away. The bass drivers on the mk2 have a ceramic silver/white color where the mk1 has black bass drivers. They are very easy to tell apart. I am a VR4jr owner moving up to VR4sr mk2.

Blessings, Bob
Thanks Bob.
I've just bought used one but I'm not sure whether it's a mk2.