Coles 4001G 16 ohm Super Tweeter, new 2020 manufacture stock. Used in Spendor BC1 & SP1, IMF, CambridgeR50, B&W DM2, DM2a, DM4, and in many DiY designs particularly transmission lines. Frequency range 1.2 Khz - 35Khz, usable 8KHz>. 19mm coil. 61mm mounting hole required. Also available in Coles 4001K 8 ohm version.
Full Manufacturers Guarantee as current production.