When did Ford start offering crew cabs on its F-series trucks?

I want to buy an older F-250 or F-350, 70s or 80s, and fix it up/restore it. However, I am only interested in crew cabs (four full doors). NOT standard or extended cabs. I'm just curious what year Ford started offering crew cabs on the heavy duty pickups for the public. I know they built some for commercial... show more I want to buy an older F-250 or F-350, 70s or 80s, and fix it up/restore it. However, I am only interested in crew cabs (four full doors). NOT standard or extended cabs. I'm just curious what year Ford started offering crew cabs on the heavy duty pickups for the public. I know they built some for commercial use (forestry, utilities, public works, etc) as well. Any help appreciated!
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