420b's

[voice of the theater]

"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.

So, a blown 420B could be reconed into a "real" 416-8B (same motor and 16" frame)?