Really think, this was a base model Monark/Firestone. Looks like the main liberties that were taken with the bike is bars and neck. If you will notice, front fender never had a headlight mounted, the frame being painted with the accents means it didn't have a tank. Not sure about rack, since it is a headlight delete, could have been a rack delete as well. If it did have a rack, more then likely it would have been the Rocket style. Early 50s.