I am glad we have tomatoes in common. The cluster looking one is called Reisce, I got one single seed and when it started to grow suckers I removed them and grafted onto other more prolific type. Now I have 3 plants producing them. Some clusters are small , others weird and others are huge... it is the main atraction here, but I have many others that are tastier. We just started harvesting some huge beefsteak (determinate), the plant is carrying some 30 pounds of fruit, and it is superdelicious.
My favorite in taste is a black Ukraine, small but with distinct flavor.
Andy, I am sorry to hear about yours, Some of these above came from those Colorado seeds. Others came from California, and my latest batch came from far east, late, but the plants are catching up, they are 4 special blacks... I am looking forward to them.
I will be saving seeds and am happy to share them with my cuttings when is time for them to be shipped.