Bolshaya pear ripening in early September

bolshaya pear, ripe in the first week of sept. largest one was a decent size over three inches across. I have a group of these grafts growing on saskatoon rootstock, bolshaya seems to do well and outgrows most other pears and it's fully hardy in zone 3. I would have more fruit if there were more pears nearby for pollination, remember to plant a few or some wild ussurian pears.