I think that's very possible, John. I have one dated '74, two @ '75, three @'77 and one @ '78.
And a few with no dates at all.
These mostly come with the internal decoration being the same as the early Michael Harris Cut-ice Lollipops - basically, it's the same beast, but left unflattened, I believe it to be Eric Dobson's design input, this notion being supported by the fact that Said didn't "rise to prominence" until '75.
I have one cube with the fish-net internal design I believe to be Boffo, and that would possibly put the date of this one to the very short time Boffo was still there after Michael Harris left.
But we still know nothing about these dates.
I'm sure it was Wolfie promised me ages ago he'd ask Mick Rayner, who was a friend of Vicente Boffo if he knew anything, but I've never heard anything back.
I also have a cube with Eric Dobson's "Tiger" pattern inside.
Every piece of Mdina needs to be taken on it's own merits - they're all individual - so whether or not it is good is in the eyes of your potential buyer. I like the internal stuff in this one, but (personally) find the neck to be a bit short and inelegant.