As far as I know, all the OEM bearings had the champhor. From day one on. All the factory service manuals I have read (not all that were published) mentioned about the bearing. The factory parts book, lists the #1 main as a different part number from the # 2 & 4. The aftermarket parts listing, lists the #1,2,and4 as the same part number.
The factory champhor is not very large, try looking at it with a magnifier.
The picture DNE007 posted shows WAY too much champhor