This is a 11/2G deep dot period mouthpiece. It is believed to have been manufactured in the 1970s. After purchasing it at auction, I used it for a year and had it replated with silver at a musical instrument store in Shin-Okubo. There is slight unevenness in the plating on the rim, but it does not affect playing. Please consider it if you are interested. Added 11/18 I will be using a smaller size myself, so I don't have an opportunity to use this anymore. I hope someone who needs it will use it.