Difference in RT series tweeters?

Gretsch6136
Gretsch6136 Posts: 80
edited August 2007 in Vintage Speakers
Hi,

I have a pair of RT12's with the Dynamic Balance tweeters. They have a dark grey dome. I have also seen other RT series speakers with a silver dome Dynamic Balance tweeter.

Does anyone know the difference? Is one better than the other?

Thanks,

Mark