This is very rare cartridge manufactured by Supex, in 70s year. This looked nearly same as Koetsu Rosewood, but it was born before Koetsu so it is called early Koetsu in Japan.
Sound is great and function is guaranteed.
Specification:
■Output voltage 3.0 mV (3.54 cm / sec 45 °)
■ Needle pressure 1-1.5g (optimal 1.3g)
■ Playback frequency band 5-30,000Hz
■ Channel separation 25dB / 1kHz
■Channel balance ± 0.5 dB
■ Compliance 12 × 10-6cm / dyne
■ DC resistance
■ Load resistance
■ Impedance 50Ω
■ Needle tip 0.3 × 0.8 mil
■ Own weight 10g
■ Released 1971-72
End of sale around 1976-1977