1971 Catalogue - Horizon Blue Pyrex Ware 

This page from a 1971 catalogue illustrates all Horizon Blue items available at the time.  During 1970 a single solid blue 474 casserole also was offered with a patterned clear lid and basket.

Horizon Blue with Early American.  Image from 1971 catalogue.

Related Articles:

Dates for Pyrex patterns/pieces: 1960s to 1980s
1970 Catalogue: Horizon Blue
1971 Catalogue: Early American, Friendship, Verde
1972 Catalogue: Daisy