The Royal Dart was manufactured for Montgomery Ward. It’s a compact, spiffy typewriter. It’s related to the Royalite/Ensign/Companion/Eldorado family, and mechanically identical, but it is unique to all of them in that its ribbon cover is raised from the body and does not continue down the sides (source).
Other people blogging about the Royal Dart:
Royal Dart found in thrift — with typing sample
SN: U 5213301
© 2013, Mark Adams. All rights reserved.