Perfekta
Golf ball-sized fruits with variable size and shape. Red flesh, yellow skin; green shoulders and a hint of anthocyanin on a couple of fruits. Fruits are somewhat juicy with a good, pleasant, intense, moderately tart flavor. Moderately firm texture; skin is noticeable but not tough. Dwarf plants with rugose, regular leaf foliage. First ripe fruit 109 days from seed emergence.
Interesting backstory! In December, 2012, I obtained 12 seeds from Bill Malin in a seed exchange. He obtained those seeds from the " Institut für Pflanzengenetik und Kulturp-flanzenforschung, Gatersleben", Germany. These had been in long-term storage and dated back to 1969 - see photo here of original seed packet. I managed to get 5 of 12 seeds, thus 42% germination rate, for 44-year-old seeds!
Extensive discussion among several growers about their efforts to resuscitate this variety can be found here: