It’s Doyenne d’hiver / Winter-Dechantsbirne / Easter Buerre (UK) . The descriptions in two 1907 & 1915 Czech pommologies fit including “The Doyenne d’hiver is easy to recognise by its densely spaced, wavy and from a distance seemingly curly foliage.”
I was looking for the Doyenne Blanc, you mentioned elsewhere in those books and came across it while skimming the 4 Doyennes that were included. (White is not.)
Thanks! Btw those two books in my link (sadly in century+old Czech that gets butchered by AI translation) are great - often describing best cultivation practices for each variety, reasons for poor performance or lower quality fruit, etc. They did some relatively good research, too. Plus, even though climate has changed, it is still (also relatively) relatable for me. The only pain is the naming.
Late Korean (Okusankichi) - Pyrus pyrifolia sp. Large, round. Green to tan russeted, Thick skin keep very well. White, refreshing, firm, coarse, crisp and juicy flesh. Keeps well after picking. Flavor improves with storage. Ripens: Late October, 600 hours chilling.
Cold hardy USDA Zone 5.
Thanks. I’ve been looking to add that, but forgot what it was called. All I could remember was it started with an O. Now I wonder if anyone on here has it?
Okusankichi aka Nihon Nashi is a seedling of Wasesankichi and the parent of Bosarge. It is NOT a parent of OOharabeni. Okusankichi is a cross between pyrifolia and sinkiangensis. I found one source in the U.S. but it appears to not sell trees currently. 4 accessions show in ARS-Grin.