Antique YAMAHA All Silver Flute Head Joint A valuable silver head joint, a custom order from YAMAHA. The diameter of the insertion opening is 19.8mm. Adjustment is required for use. There are no markings, possibly because it is a custom-made item, but the crown design is clearly the same as that of high-end YAMAHA models. I think it can be used with old series of YAMAHA and Muramatsu. A simple way to distinguish between a silver head joint and a nickel silver head joint is to hold the head crown and flick the insertion opening with your finger to check the reverberation. Nickel silver, 14K Gold, AG600, etc. have a long reverberation. In the case of silver, there is almost no reverberation. *AG850 or higher Details of the flute head joint for sale: Length: 220mm Insertion opening diameter: 19.8mm Thickness: 0.3mm light tube Weight: 76g With mahogany case Shipping weight: 312g