This is a great example of the CD 321 "Bat Ear" Knowles Prism from the power line in the Bonneville Salt Flats in Utah. These had the most interesting finish to them. Color is aqua-green and as found condition. It's as close to mint as you can get, even with an chip at the start of the threads and two tiny tiny flakes under the shell rim. Please review the pictures for details. Asking $125 plus $17 postage. PayPal please for this beauty.