420b's

[Old Guy]

"B's" were late, 1974 and after, and are the premium 420 using a 16 inch frame and the cast motor of the 416-8B.

I'm pretty sure the Madrid was out of production by the time the 420-8B came along, but as soon as i say that an "odd duck" will surface.

My bad. I think you are right, but won't guarantee empty boxes weren't sitting around and stuffed later...have seen enough weirdness to be careful about absolutes. But have never seen a Madrid with 420B. only 420A. to be technical, 420-Z.