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I think it's an underripe Dr. White- could be fully ripe on the counter top in a few days possibly.
It could be a Dr White. My Dr White looks more like the fruit in this video. Note that the two fruit in the video look slightly different even though they came off the same tree. https://m.youtube.com/watch?v=Dv0gpOPW1nY#fauxfullscreenDr White typically has a vigorous upright growth habit but can be influenced by the rootstocks. Simon