In case there is any interest, I noticed an 1892 two barrel set on Gunbroker. The link is:
https://www.gunbroker.com/Item/950595013
It is in WV and is a 2 frame D grade 12, 30" barrels. The original pictures were bad and not much info, but I have written to him a few times and have had more pictures and info posted. As far as I can tell it appears to be an 1892 Damascus with everything original. I believe everything is marked consistently for a proper two barrel set, and the book shows it exactly as it is pictured. Certainly not a pristine gun but looks untouched as to changes and may clean up into a nice representative graded 2 barrel set. The one thing I haven't been able to get yet is bore condition and chokes. Starting price isn't a low one, so no bids without more info or pictures.
I have never had any interest in 2 or 3 barrel sets. Never liked the concept for a user, and don't have an interest as a collector (no way to display and kind of pointless to me personally). Just thought I would post an alert to it in case anyone is looking for one. If he getsno bids on a 14day auction, he may reduce the starting price.