Good morning to both of you,
Mum I cannot remember if it was F1 or not!
jambop, I think you have the wrong end of the stick, I've planted a straight Estamino plant as I had no other variety to graft and the Estimano plant is 'rather large but few tom' trusses', the seeds will come from that plant and not from the grafted job. I cannot say what the grafted variety is as we liked the tom fried on toast for breakfast we just call it 'the breakfast tom'!.
Cheers, Tony.