This is a possible Acer sieboldianum grown from a young seedling which I mentioned in another thread a while back. The history is that a family member went to a UK gardening show and brought back a small pot with five "Japanese maple" seedlings in as a gift. This was one of them. I wanted to post some pictures and see if anyone had any thoughts one way or another... I tried using the vegetative key downloaded from the maple society website but the plant fails the last stage as the petiole is not clearly pubescent. However the alternative with glabrous petioles is A. circinatum which it does not look like to me. According to Peter Gregory's 2004 article on A. sieboldianum these plants lose their pubescence as the summer progresses and the foliage ages so I might just be too late and missed it. I will check the foliage next spring. Also need to check the flower colour in spring, should be white/cream if correct. The foliage looks a bit beat up due to the drought. The plant lives in a container at my brother's house and he is often away for several days per week so may not always get watered often enough. The samara angle is variable, some are quite curved, almost like a horseshoe but many others are flatter, certainly within the 130 to 160 degrees angle mentioned in the Gregory article.