I just found a video of a German poultry show and they labeled it yellow mottled. Surprisingly where I am they aren't that hard to find and there are quite a few breeders around. Not sure why there's not much on the internet.
I think it's d'anvers too. It matches the description but I could only find a single photo from the internet of a d'anvers with similar coloring which is the one you kept. I find this very odd.
I was just gifted 3 Bantam chicks. I know what they are just not in English. I am really struggling on figuring it out. They are bearded. I think they might be one of the Barbu chickens but I'm not sure. Here's a Pic of the chicks and an adult pair.