Okay, here is why I’m confused. The following photos are pages from two different, highly respected books.
This photo is from Indian Silver Jewelry of the Southwest 1868-1930 by Frank Holbrook c. 1978 and is calling the two closed-center concho belts “first phase, circa 1885”
This photo is from Southwest Silver Jewelry by Paula Baxter c. 2001 and is calling this closed-center concho belt “second phase, circa 1880s-1890s”