British Pedal Company Vintage Series Professional MKII Tone Bender OC75 vs OC81D Demo 

BPC Professional Tone Bender MKII OC75
The BPC MKII Tone Bender is a detailed replica of the 1966 PROFESSIONAL MK II Tone Bender pedals created by Gary Hurst. The circuit unlike the MK 1.5 had a 3 Transistor circuit that based on producion and supply comprised of either OC75's or OC81D transistors.
BPC Professional Tone Bender MKII OC75/OC81D
Aluminum cast casing
Level and Attack controls
3x NOS OC75 Transistors or 3x OC81D Transistors
Limited production
As used by Jeff Beck , Jimmy Page and The Spencer Davis Group
Certificate of authenticity