Please identify apple tree?

Jordan Selsor

5 year old buck +
Ok This tree is at an ambulance station in east central Mo. Its safe to say its a crab apple. Any ideas as to what kind and drop time? Think its worth growing from seed or grafting to a hardy rootstock? Tks in advance gents
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I did taste a couple. Tart but a good tart. If that makes any sense
 
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