Mystery Spindles a Mystery No More!
Well, based on the responses I got on the Spindlers listserv, I think I've got the following spindles:
Mystery Spindle #1 = a Hatchtown Farms Kaari spindle. That's pretty cool since those spindles are pricey ($40+) and well-liked by a lot of spindlers. I haven't yet spun anything on it (the cop in the photo was made by the prior owner), but I'm looking forward to giving it a try soon.
Mystery Spindle #2 = a toy car wheel spindle. Wish I knew more about the name and date, but the shoddy construction does scream homemade. Still, it's never a bad thing to have some cheap, homemade spindles, even if only to have on hand for curious kids to play around with.
Mystery Spindle #3 = a Kokovoko. The shape looks right, but most of the Kokovokos I found photos of online were top whorls, not bottom. Still, I know that Kokovoko does make a bottom whorl spindle, and this so closely resembles the top whorls that I can't imagine it being anything else.
Thanks to everyone who offered suggestions!