I published this article back in March 2019 in the Barber Coin Collectors' Society quarterly journal. At the time, I thought it was kind of a big deal, that there was actually a third Barber dime reverse design type. All the literature says there were two reverse types, "old" and "new", "thin ribbon" and "thick ribbon", and that the second was introduced in 1901. Yet, there was actually a new reverse design introduced in 1900, and the 1901 "thick ribbon" was really an addition to the 1900 type, not an addition to the original 1892-1899 type.
Along the way, I discovered a couple of new transition varieties. The new 1900 reverse was apparently put into service in Philadelphia ahead of the new century, and so there are 1899-P dimes with the 1900 reverse. And San Francisco minted some 1900-S dimes with the old 1899 reverse.
Funny to me, I got absolutely zero feedback from that article. I mean, how many times is a new design type discovered in US coins from 120 years ago? So, I figured maybe it was common secret knowledge, previously published elsewhere where I can't see it, or maybe nobody cares. But I was encouraged to post it somewhere, and so here it is. It would be a shame for it to disappear into the numismatic black hole. If anything, it would be nice for the guide books and the TPG "facts" sites to get the story straight.
https://drive.google.com/open?id=1DGaN6teGJiZ6jK81G9KJsPPHxTUo9dTY
If the link doesn't work, let me know.