Riccar is a Japanese company, and the Japanese are famous for their copies of the Singer model 15 machines, of which this one is an example. The Japanese clones are usually good. They even call it a model 15, ha!
I would say by the colors this was made during the 60's.
This is a very cool-looking machine and should clean up well. The wiring looks SCARY and should definitely be replaced before using the machine, or at least checked out by someone who knows what to look for. The wiring coming off the motor looks
really dried out with age.
Here is a link to the ISMACS site, on the history of the Riccar company:
http://www.ismacs.net/riccar/the_ric...a_history.html