How'd I Do? (Question About Walkers)

Ok, so I'm just going to throw it out there that all I know about walkers is what's in the RedBook, and that isn't much. But still, I think I managed to get a pretty sweet deal on four walkers this weekend at an online auction. Here's what I got:
3 1916-d in AG/G and 1 1919-d. The four of them shipped were $23, not too shabby.

I'm trying to get a general idea about resale value and popularity. Here's a quick description:
1916-d in G4. This is probably the nicest in the lot. It may have been cleaned since it looks a little too white, but I don't see any hairlines.
1916-d in G4. This would be really nice, and probably nicer than the one above if it didn't have some light scratch marks on the reverse. It almost looks like damage from a flip. Probably also cleaned.
1916-d in AG3. This just has good, honest wear. No signs of an old cleaning.
1919-d in AG3. This looks really nice. It's got a nice original look, and the only flaw is lack of detail.

Now, I'm not too big of a walker fan (although some people on here probably are). So, based on those quick descriptions, what should I expect to get if I sold them right now? I'm going to the GNA show this weekend, so I might sell them there. What should I roughly expect from a dealer?

Thanks guys!