This antique Keystone Model 421 Radioptican Magic Postcard Projector is a true gem for collectors of vintage photography and projectors. Made in the United States, this postcard projector is a rare find that allows you to display your favorite memories in a unique and magical way. With its stunning design and top-notch quality, this postcard projector is perfect for anyone who wants to add a touch of nostalgia to their home decor. Whether you're a collector or just looking for a unique piece of equipment, this antique Keystone Model 421 Radioptican Magic Postcard Projector is sure to impress.