Mid-70s, in descending order of quality/price of some of the top Fuji's is as follows, to my recollection:
Top of the line: Fuji Professional Double Butted ChromeMolly Steel (have a '75 model for sale); Fuji Ace (first-ever Dura Ace gruppo); Fuji Newest; Fuji Finest; Fuji America (with triple chainrings for touring); STS (male version) & S10SL (Ladies mixte model).
The Del Rey, is to my recollection a later and lower line model.