First introduced in the mid-1930's as an after-market accessory by several companies, it was later reproduced for a couple of years in the 1970's by CASIO. After a break of about 30 years, it was once again produced by RootLieb sheet metal in Manteca, or someplace nearby, California. Their '3-Door' accessory hood sides are still available from some of the suppliers.
Judging from the 'patina' of the Vicky in your photo, it may be that your's in an original from the mid-'30's.