The plate size of this daguerreotype is 1/16th: 1 3/8 x 1 5/8 inch (3.5 x 4 cm)!
This is the smallest plate available. It shows how incredible sharp and full of detail these photos can be. It dates back from around the 1850s. I have searched a long time for this plate size, and finally bought this one at Ebay for less then 30 dollars.
Notice the beautiful dress, jewelry, and the books on the table.