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There was a 1949 CJ3A... it was the first. The CJ2A had a split windsheild. The CJ3A had a one piece windsheild with a pop-open air vent under it in the windsheild frame.
He's right though, they didn't make the CJ3B until 1953. It had a distinctively higher hood for the "F" head Hurricane engine. It also had the one piece windsheild but not the vent.
Hope that helps
Got a picture of the Jeep?