Valvo transistors were produced in Germany, as a subsidiary of Philips (not unlike Mullard in England).   More information on Valvo can be found here.  My experience with Valvo, is that they are pretty much identical to their English counterparts.

The OC45 is a PNP germanium alloy transistor intended as IF amplifier in AM broadcast receivers.

VALVO OC45 / OC44  GERMANIUM TRANSISTOR DATASHEET