Reddit reviews The Navajo and Pueblo Silversmiths (Volume 25) (The Civilization of the American Indian Series)

Early is perhaps subjective- There's little available that's truly antique as far as NA jewelry goes, considering the first development of silver work was in the late 1860s, and extremely little was made until the 1880s. To get a piece that is pre-1900 is once a year at most, at least at a price I can buy it for myself or to resell anyways. The vast majority of NA jewelry is post-1920, with significant increases in production in 1940s, and post-1960s with respective tourist booms.

I can dig out some photos of personal pieces later, but can offer some tidbits of information I've always found fascinating. My biggest love is the Ketoh, one of the only items where it was a type of object actually used prior to the adoption of silversmithing among NA tribes. They're leather bowguards adorned with a plate of silver over the top half, the earliest (1880s) ones being tufa-cast and most post-1900 being wrought sheets with heavy stampwork and repousse. They didn't sell at all with tourists, so most of them were melted down to make more popular items as well as reworked into box lids. They're incredibly scarce now.

I highly, highly recommend reading the book "The Navajo and Pueblo Silversmiths" by John Adair. It was written in the 1930s and sources much information from 19th century bureau of ethnography reports. It's also easy to find and usually under $10-20 for the new edition.

Edit: Here's one example that is in another collectors hands now, a ca. 1895-1900 Navajo cuff.