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Below each frame there is a bit of rhyme in German telling the tale.

Even the German Schnauzer in the last frame knows the man should have bought a Telefunken rohren!!!!!

PQ6689/E83F PQ (Premium Quality) logo is on other side of tube.

Evidently this tube sat for 4 years before being boxed. Note that this box has North American Philips written on it.

Month=third and fifth digits=08=August Year=fourth digit is the year, 8=1968. Genuine Telefunken Germany (Berlin and Ulm) made tubes have a diamond mark molded into the glass between the pins.