MAF, what AKMark says is correct. I used to peruse flats of Early Girl F1 in local nurseries looking for PL plants. I usually found one or two every year, nestled in amongst the true RL F1 Early Girls.
When I grew out the PL plants, they produced nearly identical fruit, but the plants were a bit more "floppy" than the true RL hybrid plants. I assumed at the time that someone erroneously harvested self-pollinated fruit from among the same plants used as seed plants for the proper cross. You know, picking an occasional "untagged" tomato somewhere in Southeast Asia.
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