Please add a photo of the piece and the 21 China mark. You can do this by using the paper clip icon or the ADD FILES button. These features work best on a desktop computer and don't work with smart phones. You can also email pictures to***@******.*** and put FOR RAREWARES IN ANTIQUES in the subject line so that they will get forwarded to me. This method takes a bit longer, so thank you in advance for some patience.