I ordered this a few months ago. It's a CR3C rim + CR backbore + heavy weight (Phatrick) + GP. This is quite a rare item, and it takes about a month to order. The size feels similar to a current Bach 1 1/2C, and the official website says it's close to a Mt. Vernon 3C. It produces a very rich and powerful sound. I am also listing this on other platforms, so I may cancel the listing at any time.