Mullard CV31 / U20 / FW4/800 NOS

Mullard CV31 / U20 / FW4/800 NOS
Mullard CV31 / U20 / FW4/800 NOS
Mullard CV31 / U20 / FW4/800 NOS
Mullard CV31 / U20 / FW4/800 NOS

Mullard CV31 / U20 / FW4/800 NOS
1 Mullard CV31 / U20. I believe it is NOS.
Mullard CV31 / U20 / FW4/800 NOS