About 1971 or 72...
this was for sale last fall and I would have bought it as I'm looking for a Coppertone range, but it has a crack in the glass panel from top to bottom on the R side, hard to see in the pics, that I see the seller has chosen not to disclose. I suspected as much when blowing up the pic, and the seller finally did admit this defect before we made the 3 hour trip up to Clifton Park. That's not how I'd sell things.