In the years I've been collecting and selling enamel on sterling butterfly pins, this one stands out as being very unique.
It is marked sterling silver on the reverse with raised letters and it has an old style C-clasp. It dates from the turn of the 19th century and the quality is on par with any Norway or Denmark pin by Marius Hammer or other contemporary of the times. Very similar to butterfly pin designs by John Atkins & Sons (Birmingham, England). However, we believe this one is made in the USA because of the marking of just "sterling silver".
It measures 2" across at the top of the wings.
As you can see from the photo, the butterfly pin is very striking with the black veining throughout.
The condition is fair as their are a couple of spots of flaked enamel - the most notable the area on the top of the bottom left wing where there is missing black. (see star next to the area). On the right side, the white area is light reflection off the shiney finish. However, all together, this pin is extremely wearable and EXTREMELY well priced. As it shows in the photo, there is also a very slight bend to the right side antenna.