I've never seen any real dates for CHF... other than some of the pieces marked chicago hardware with the favorite name on them are assumed to be sometime right after 1936 or so, when they acquired favorite brands and patterns.
It still seems odd to me that they made the items marked 'chicago hardware and foundry', the hammered pieces which are marked with completely different markings (8 8, and 83 and 85 and etc)... and the number in diamond pans, again, marked completely differently than anything else they made.