matched pair ECC83 / 12AX7 Philips Miniwatt, made in Holland, audio twin triode.
Test very good on AVO tube tester.
(Avo book spec for new valve: 1,6mA per triode).
Test result: first tube 1,7 - 1,7mA code delta7c
second tube 1,6 - 1,6mA code delta8I
Early 17mm long plate and foil D getter type.