Pictures
Hi Tom and welcome,
It's impossible to give anything specific without photos. You have a late model wringer with a pump and safety foot release for the wringer. The good news it that it's top of the line for a wringer, the bad news is they are very common.
The value will depend on condition, rust, damage to porcelain, type of agitator, color etc. Most of the prices you see on Craig's List and eBay are wishful thinking.
Again, depending on condition, I have never paid more than $150 for a wringer, and that was my first machine. (by total fluke, it was the rare NX model, so I think I did pretty good). It's not unusual to pick them up on the last day of an estate sale for $25 because they just don't sell.. it's a specialists hobby.