This Trident maple (Acer burgerianum) was imported from Japan in 2016 by Walter Pall. The tree is around fifty years old and about 50cm tall (20"). The pot is by Walter Venne. Here's Walter's caption... "The maple got a new pot by Walter Venne. To many this will be a big surprise. Ten years ago one could not get a red pot nor could one sell it. Now it's still very new and somehow daring to use one. In ten years it will be common. A shift in taste is going on."
Walter Pall must have one of the largest selections of imported Japanese bonsai in the world and he usually sets about upgrading each tree fairly soon after he receives it. If you compare the original photo (just below) to the other photos here, the changes are obvious.
Though Walter doesn't say, you might imagine this photo was taken in Japan before the tree was shipped
Fall color in an earlier pot. The guy wires serve to lower the the main branches. With apically dominant trees, lowering branches is usually essential if you want to create and maintain a natural aged look
Same photo as the one at the top, but with a grey background this time. Walter usually features at least two background colors
I cropped this one for a closer look at the trunk and rock