I just reviewed all service counselors to 1948, no luck, however it seems pretty likely this part number was "issued" post 1948. I suspect since this number doesn't appear until the 55-56 parts book, it is a superceding number. (though every other bearing purchased at the same time is pre-48, and the box has the older blue/white label) My personal suspicion is differential or transmission bearing due to open/roller design. Probably transmission? Can't think of any other application. Not Axle or Pinion as those would be tapered roller style, at least post '37. There are a couple pre'37 pinion bearings that are similar in design?
The bearing itself is 100mm x 25mm x 45mm, big, thrust face roller bearing. MRC-7309. There is no race/cup as might be suggested by Joel's info...maybe this was supplied with a shim/washer for whatever purpose and simply titled as such? Hopefully this will help narrow it down. Its no good to anyone if I can't figure out what it fits!
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