The saddle on the right has some surface flaking of the top layer where it had been polished (I'm guessing) No cracking or splits of any depth. It certainly feels solid. So, maybe gone or maybe not. I'd still like advice on how to proceed.

Here's some pics of the bikes. Early 70s 3 speeds with Sturmey Archer AW hubs. One says 72 the other date I can't find. Pretty nice condition overall. I actually saw two kids riding these bikes in the neighborhood a couple weeks ago.