I have a clorox bottle with the triangle Illinois Pacific logo with a date code of 1928. It also has REG on the bottom along with clorox in a big diamond. I am most sure I have an earlier clorox bottle with the triangle Illinois Pacific logo, but no date code. Neither does it have the REG on...
My clorox bottles made by Owens don't have the duraglas on them before 1947. So I would say 1951. The date code on the clorox is also to the right of the Owens logo.