Hot answers tagged set-numbering
The letters typically represent the initials of the set designer. See more discussion on this topic in this EuroBricks forum thread. For example, the initials "MB" stand for Marcos Bessa, where "MS" is for Mark Stafford. Some other sets also carry set designer initials, sometimes subtly incorporated in the build (I believe Jamie Berard, the famous Modular ...
This is from set 60007: High Speed Chase based on Chains M Plate M 5 Ø¸3, 2 Hole. There are only two sets with this part in Medium Stone Grey. The other set is the Star Wars UCS B-wing
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