Wow! Jackpot! Dan Dean and Laura Kelly turned me onto this one. It’s a huge (as big as Korean Giant) European X Asian cross from Oklahoma, mid-1960s. Dan and Laura’s Turnbull tree was between two Asian pears that were both riddled with fireblight. Turnbull was clean as a whistle even though it was just a few feet from these other two blighted trees. Sweet and tart, crisp, and does not have to be cured.