Hey Nick - sorry about that but I've gotten bit by the vintage Howaat bug!
The Diablos I have are works of art - the risers are as gorgeous a mix of woods as I've ever seen and the distinctive sculpting of the riser shape is just plain cool! I know a little about dating them - just enough to know they were made in 63, 64 or 65.
The few NE Plus Ultras that have a similar look that I've seen some of you more knowledgeable guys post about were all dated from 59 - 61.
I'll post some pictures of all 3 when this one shows.