Yes. In addition to the quarter-mil groove Highway Hi-Fi 16-RPM discs which need a stylus four times smaller than a 1.0 mil mono LP stylus or three times smaller than a stereo LP stylus to play, there are plenty of Stereo 16 RPM discs.
Allied Artists in the 60's had a very limited run of Stereo 16 RPM titles in addition to their mono catalog on colored vinyl.
Vogue has several in France, and a few are stereo.
South Africa has a TON, but all mono. Look up `16 RPM' on YouTube.
Will Kennedy's Dance Time orchestra is probably the most famous stereo 16 RPM as well as the most readily available.
These have a clock face on the cover, different releases with the different covers, maybe a dozen in all.
Prestige Jazz has a half-dozen mono titles you can occasionally get on eBay for $20-30.
Seeburg titles, and their Rowe-AMI counterparts whether the 9-inch 2-inch hole hourlong/side discs or the 14-inch two-inch-hole two-hourlong/side discs are indeed all mono and best played with a zero-point-five mil stylus (0.5), 2/3rds the size of a stereo LP stylus.
The 7-inch 1.5-inch 45-sized hole versions by The Audio Book Company in St. Joseph Michigan has both vinyl and styrene titles, pressed by both CBS (you can see the ZSP number in the dead wax) as well as RCA (you can see the`S' number (1S, 2S etc) in the dead wax) and carried both spoken-word selections on blue labels, and musical selection excerpts on the red label.
Be careful though. They look and feel EXACTLY like a 45 from the 50's and can get very easily lost in a stack of singles at a swapmeet. You have to look for the telltale microgroove cut, the AudioBook logo, or the red or blue label. Then they also had a 3-inch center-hole superflex vinylite version of the Old Testament and New Testament in a nice leatherette binder and box. If you find one with the 3-inch turntable adaptor, even better.
You can use the same adaptor to play Aretino 78 RPM records with 3" holes.
And The World's First 16 RPM Music Disc just sold on eBay for a mint, eBay Item number: 370120454377 in poor shape no less, as did a copy of the South African Best of Gentleman Jim double album in the rest of the world, 16-RPM single disc in South Africa.
There's also the 12-inch colored-vinyl mono Lingua-Phone discs, and plenty of mono Christian Science Monitor 16-RPM LP's with the braille on one side you can find in thrift shops all over. Since these were all cut on the first system discarded by RCA New York and trucked down to Kentucky, you can play the musical number included on each one and be astonished at the fidelity from a 16-RPM. And speaking of Talking Books, there's plenty of 8-RPM flexidiscs around.
And finally there's the mis-masterings of several Mobile Fidelity, Nautilus, CBS Half Speeds, and various people's CD-4's that exist in test pressings only. Some fool forgot to take the tape player down to half speed when they were cutting the lacquers and several of these were plated and sent to test pressing before the error was discovered. Then supposedly the test pressings were set on a counter to be discarded when they disappeared out the door during the lunch hour one day, and now they float around the vinyl world occasionally.
As far as eBay 16-RPM category being mostly wrong, I used to eBay-Note everybody who had their record mis-classified in 16-RPM and all except for a couple re-classified their listings. But you'd have to have a dedicated cadre of guys to ebay-Note all the guys every other day just to keep the section unpolluted with 33's. The few guys who refused to re-classify their records wrote a nasty note back talking about the better coverage being in the wrong category.