This grower is sure of this plant identification.
Lycopersicon esculentum ‘Diplom F1’ (Tomato). This is a medium sized red tomato with good flavour, firm fruit and disease resistance. It has early maturing, uniform fruit are produced over a long season on plants with an open growth habit. This is an 'indeterminate' or cordon variety
Feed continuously over the growing season and keep moist and well ventilated.