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Monthly Science: USDA Inspection Stamps
I recently bought a pair of pork belly packages, one labeled “Local” at an additional buck a pound. They were packaged skin side downward, so the USDA inspection stamps came as a surprise:

Pork Belly Skin – USDA Stamps Turns out the digits give the “establishment number”, which you can look up online. These came from a processor in Pine Plains.
We presume they keep track of their pigs …