True Potato Seed ...TPS... can vary greatly in size and plumpness. TPS saved over a forty year span with the LENAPE variety has always been among the largest TPS among the tuberosum clones. Here is a picture of seed extracted today.
Larger seed means more food for the seedlings and as a result...larger cotyledons and seedling size at early stages. Lenape makes for a great seed parent when crosses are made...the hybrid vigor plus the extra seed size creates a remarkable improvement over smaller TPS clones.