One of the best seemingly little known bonuses about plants that produce an occasional male flower is the pollen is short the male chomosome and the seeds it produces will be all female. More serious hermies produce the same result, but the offspring carry the same disposition for widespread male flowers. As some know, this is how feminized seeds were developed, that some complain about carrying too much hermie traits in the plants. It is possible the grower had a male that created that seed and you got lucky with a female, but not likely.