Confidence: It's likely to be this, but I can't be certain.
Notes: These alien maples are difficult, not least because there are so many cultivars. This could be A. crataegifolium, but A. davidii 'Madeline Sitta' and 'Ernest Wilson' are extremely similar without a close examination. However, A. davidii has rather odd-looking white peg-like structures under the leaf vein joints, which are not present in A. crataegifolium. Not able to see on the photographs.