From Tomato Dirt: “The Yellow Pear is known to have been cultivated in Europe as far back as the 17th century. Renowned biologist and taxonomist Christiaan Hendrik Persoon first recorded it in his Synopsis plantarum in 1805.The variety spread to North American fairly quickly.
1825: The Hudson Bay Company at Fort Vancouver, though the headquarters of the Northwest fur trade, also operated a farm with vegetables, fruits, herbs, and flowers and sold Yellow Pear Tomatoes.
1847: Yellow Pear was one of three tomato varieties recorded to be grown in the U.S.
1863: 100 varieties of tomato seeds were sold in the western territories (Utah and Colorado) by seedsman Joseph Ellis, including the Yellow Pear.”
One of the varieties described in Carolyn J. Male's book "100 Heirloom Tomatoes for the American Garden"