The white interior on this 14x14 would support the early date (1968). The early Standard shells have the white paint (possibly using up shell inventory since the Classics went to clear interiors around then) and then they went to the gray interiors fairly soon.
I think the white interior is way cooler. Bit of a score, this drum you have Tim. 14X14 is a favourite size of mine...
And now some real drumming on The Partridge Family
[ame="https://www.youtube.com/watch?v=WE4sI6th2H0"]Amazing Drummer!! Debra Pearce from Partridge Family! - YouTube[/ame]