You're all correct and you're all incorrect.
All 12-1/4" Craftsman/Dunlap drill presses have bronze sleeve bearings.
All 13-1/2" and 15-1/2" drill presses have ball bearings. Actually, both have the same bearing part numbers.
When referring to Craftsman 80's and 100's, date of manufacture is important. Prior to 1950, both 13-1/2" and 15-1/2" drill presses were referred to as Craftsman 100's. The Craftsman 80, at the time, was 12-1/4".
Starting in 1950, the 13-1/2" machine was demoted to a Craftsman 80 and the 12-1/4" drill press was rebadged to Dunlap until 1964 when it was rebadged to Craftsman again with the crown logo head band.