Supposedly one story says that the American giant seckel is one of the parents not the true seckle and doyenne du comice pear is the other. Other stories say its the seedling seckle x comice and not a seedling of seckle x comice. Many pears have a slightly different title that can mean something different in another language. This is the challenge as you have learned in identifying pears. Misidentification happens more often with seckle. Every sugar pear becomes seckle. As described here not every pear called seckle is really seckle. The american giant seckle is not the real seckle we all grow as seckle Giant seckle
If we go by the usda database we will still be confused
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436235
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436384
“No one is sure exactly when and where the Seckel Pear Tree originated, but it’s believed to have been found growing wild somewhere near Philadelphia by a farmer in the late 1790s or early 1800s. Having been discovered in the wild so long ago, it’s commonly thought of as an American Pear Tree, although it’s more likely that it arose from seeds that German immigrants had brought from the Old Country. In any case, Seckel is well adapted to the weather conditions of the eastern U.S. (many Pears prefer the West Coast climate). This tough heirloom is also valued for possessing a natural resistance to fire blight, a destructive disease that can strike Pear Trees.”
“Seckel pears, believed to be botanically classified as a hybrid cross of an Asian pear, Pyrus pyrifolia, and a European pear, Pyrus communis, are one of the smallest varieties”
" Warren pears were once nicknamed the Post Office pear because they were rumored to have been discovered by Thomas Warren growing naturally outside of a post office in Mississippi. Later on, as the variety was established and the rumor was deemed inaccurate, Thomas Warren changed the name of the variety to Warren pear, after his last name. In the modern-day, Warren pears are considered one of the most flavorful American pear cultivars. The variety has been praised by famous chefs, including Alice Waters, and celebrities such as Oprah Winfrey and Martha Stewart for their complex, floral and fruity taste.
Geography/History
The history of Warren pears is filled with mystery, rumors, and a touch of whimsy. The first written record of the variety was featured in Pomona Magazine in 1986, claiming that Thomas O. Warren had discovered the Warren pear growing on a tree in a friend’s backyard in Hattiesburg, Mississippi, in 1976. Once the article was released, Warren began to tell a new story of how he found the fruit on a tree beside a post office and USDA soil conservation service office. This rumor remained the primary origin story for quite some time, and many growers in the present-day still retell this story as the pear’s true origins. At some point in the late 20th century, Warren was questioned about the validity of his post office discovery, leading Warren to change the story once again, saying he found the fruits at an old test site of Mississippi State University, where the pear variety magness was once planted. Magness pears were developed from the same cross as Warren pears, the American giant seckel pear and the European comice pear, leading many experts to believe the two pears were the same. Oregon State University eventually disproved this theory, deeming the two cultivars similar, sharing the same parents, but genetically different. Today Warren pears are available in limited quantities through specialty orchards across the United States. The Warren pears featured in the photograph above were grown at Frog Hollow Farm, located in Brentwood, Northern California."
The question you asked has a very complicated answer.