I know this is a long shot, since this board is on life support, but it can't hurt to try. I have been trying for several years to find a remaining source of Tom's Negro y Azul (the clone, not TPS). I would like to clean it up if it still exists. Every lead I have followed so far has been a few years too late. I am also generally interested in cleaning up other TW varieties that still exist.
Gardening where temperate rainforest meets the sea: Jan avg low temp ~34*F, Aug avg high temp ~69*F, ~104 annual inches of rain, but only about 15 inches May-Sep, salt air, lots of wind.
....."only to let them disappear".... I find it so sad. Where are the idea of making them disappear? It shouldn't be hard to find land for potatoseeds, much easier to maintain on a field than tomatoes!
The only thing I can offer is this picture from 2009. Negro Y Azul is upper row 2nd from the left. It was not very well adapted to my garden conditions. Azul Toro was very well adapted, though it produced so many potatoes that most were small. I would love to have Azul Toro crossed with a larger white potato like Kennebec.