Now, Al, not all contemporary Castellos have really chunky buttons. Maybe most.I've had (and still have) Dunhills from the 60's, 70's, 80's 90's, early OO's and The White Spot. In that 10-12 pipe group, I can't say any era smokes better than another. The new White Spot had (2014) a better stem/button than a same era Castello (unless you like really chunky buttons).
In the 1999-2001 period I put together a 7 day set of group 5 Ring Grains that were in every respect, aesthetically and from a smoking standpoint, the equal of my post WWII patent number Dunhills, which I had considered the prime of Dunhill production. I suspect that with patience I could do the same today.