All my T-Bird saddles are notched - you can't really play them unnotched, at least I can't.
I think they made a few more than two of the full maho neck ones in 1963. I remember a 63 one being for sale on ebay a few years back - had it been one out of two it would have certainly fetched more of a premium (and the seller knew what he was selling though his angle was the early date, not the neck composition though he knew about it and mentioned it). I've seen early 64 models with the full maho neck too, never heard that they are especially collectible though.
IMHO, all structural considerations aside, the nine-ply looks much nicer too. It's a defining trait for a "real" TB in my book, just like the neck-thru structure is. More vital than the color of the hardware if I may coyly add. I'm still waiting for someome here to establish the case how black hardware sounds worse than nickel or chrome.
Uwe