New old stock made by Peerless Denmark for MTX Audio. Features a 26mm treated silk dome, acoustically damped pole-piece chamber, semi-waveguide faceplate, under-hung voice coil geometry and user replaceable diaphragm assembly. Smooth response, high sensitivity and low distortion. Also known as the Peerless SR-10. Peerless label under MTX label. 

Specifications:
Nominal Impedance - 6.8 Ohms
DC Resistance - 5.3 Ohms
Sensitivity (1W/1m) - 92.5dB
Freq. Response: 2000-20000Hz
RMS Power: 80W
Fs - 986Hz
Le - 0.08mH
Air gap height - 2.5mm
Voice coil length - 1.6mm
Voice coil diameter - 26mm
Linear coil travel (p-p) - 0.9mm

Measurements:
Overall Diameter - 100mm (3.94")
Cutout Diameter - 79mm (3.11")