It seems to be the company's OS-5000T, but since there is no model number stamp and rust is severe, it is currently sold at a low price. Alnico horn type tweeter unit. Equipped with an 18 mm, 8 micron thick titanium diaphragm. The high degree of perfection can be seen from the solid, sturdy construction and fresh tone (Fujisawa Sachi)
Maintenance information: 2023.10.27 Operation confirmed
Accessories: none
Main specifications: horn type tweeter 8 Ω (measured 9.9/10.2 Ω) output sound pressure level 105 dB 7000 to 28,000 Hz 6 kg