The markings down the left hand side I believe is sub mask. The markings 004 & 006 was tested to see the difference when compared with 002 markings. I will try and find the link and post back here.
I do believe the freescale symbol on 68060 is up to date with those markings. Chips here with markings 004 or 006 have a early 2000+ year date ie the latest date I have here is year 2003 for MC68060RC60 with 006 down the left hand side I use those markings along with the date production to identify fake 68060.
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