Here is additional information no longer easily available in the USA. I edited the title to include its other name Grand Champion. This will provide the entire story of this pear.
" What is Grand Champion Pear
Grand Champion Pear (scientific name: Pyrus communis cv. Grand Champion Pear) is a species of Western pear, discovered in 1936 in Oregon, USA as a mutation of Gorham “Josephine de Malines” Williams. It was registered in the U.S. in 1943 and introduced to Japan in 1953.
The fruits are small in size, but are popular for their rich flavor, which combines the sweetness of the pear with a sourness.
Flowers appear in April and are harvested from September to October, but the best season is from early October to early November, as they need to ripen for about two weeks before they are tasty. Pears are not ripened on the tree but picked and stored.
Common name: Grand Champion Pear, scientific name: Pyrus communis cv. Grand Champion Pear, cultivar: Grand Champion, year of registration: 1943, country of registration: USA Origin: Oregon, U.S.A.; Arrival in Japan: 1953; Place of origin in Japan: Hokkaido, Nagano; Harvesting season: September to October; Season: Early October to early November; Fruit weight: 250-350g; Fruit shape: chunky cone; Rind color: yellowish brown; Taste: sweet and sour; Applications: Fresh, jam Uses: fresh, jam, sherbet, confectionery. Flowering season: May; flower color: white; flower diameter: 3 cm (medium bloom); blooming style: single-petaled."
Currently @Fusion_power a member of this site is working on cataloging a master list of varities of pears. The mutation Shannon came from the Gorham pear which was bred from Bartlett x Josephine de Malines at the New York Station Geneva, NY, in 1923. Shannon was a genetic bud mutation of the gorham pear. A bud mutation or sport produces something unique like this A truly beautiful pear bloom you must see. Call it rosebud? which is what grand champion aka shannon is. Since W.F. Shannon discovered it, his last name was used. Several varities are called by my name but i did not name them that Clark's Crabapple. A fruit has to be called something. When you give a friend an apple or pear you developed that friend gives it or sells it to others and the next thing you know it’s called Clark’s crabapple.