Mystery apricot identification?

Help me with identification of this apricot tree. It is in the Bay Area, the tree is about 15 years old, it ripens 2 weeks before Blenheim. It is large, uniform in color, it turns a beautiful orange before it is fully ripe, and generally does not turn red.

To me it tastes like Tomcot when picked too early (that astringency) and I guess it is probably Tomcot but I am not sure I have tasted enough cultivars to really know the difference. The flavor is not too bad, but a little boring (not aromatic, not very sweet, has mild to moderate acidity. Physically, the size is quite large. Thanks for your help. Is this just Tomcot?


Does it have a graft line?
Or is it a seedling?