CD102, the famous diamond pony. Did you find it in the wild or buy it? They're ubiquitous in Canada, not sure if they were used in the States or not. They're common but still fun to collect because they come in all sorts of different colours.
Interesting. I'm not aware of any Diamond insulators used in the U.S., but I suppose it's possible a small operation like an independent local phone company might have bought equipment salvaged from an old Canadian line. The AT&T affiliated companies would have stuck to their standard styles.
Dark yellow green $15-20. Diamond 102s are some of the most colorful and affordable insulators. I have several in a variety of colors. The middle one in the purple grouping is altered, it's been irradiated.