Tell Me About National

I just won an auction for a #9 National Wagner Ware Sidney -O- 1359 dual logo. Not as nice as finding one for a couple of dollars at a garage sale, but then again I don't spend much time in the hunt. Which time frame was this skillet made?
 
Do all National marked pans have heat rings? and did Wagner actually make heat ring pans until 1940?
 
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