It is hard to say if units were over or underrated today. The old rule of business as always, was to charge as much as you can get away with!
The imposter was indeed the Grundig which in this case is a Philips unit. The add also wrongly states it had a ceramic cart; Philips used a piezo cart.
Grundig never produced a turntable but used many brands, all re-badged, with the exception being Dual. It was never re-badged but did sport the Dual name in addition to Grundig's name on the platter, on latter units like the 1239a, a specialty for Grundig. Why Grundig, the world's larger taperecorder manufacturer did not make TT's is mystery. There certainly was no technical reason why not. I guess he just "squeezed" prices with the sheer volume of stuff he bought. Dual supplied about half of its production to him, as did PE at one time or another.
To get an idea how big Grundig was, in 1954 when the firm was just 9 years old, the daily (8Hr) radio production (not including TV or any other Grundig product), if stacked like a tower would reach a height of 1000 meters. The daily tube requirement was 25,000, and if all types of wire where joined end to end, would equal 20,000 kilometres -daily! Loudspeaker production daily was 10,000 units. He had, at this time 9000 workers in Fuerth. That is a mere pittance as to how large he would become at his zenith. Sadly, that company is also history, as it fizzled out in 2003.
BTW, for the Euro buffs, wegavision has many manufactures technical, owners and sales brochures to download:http://wegavision.pytalhost.com/
The specific article I was looking at about Grundig is found here:http://grundig.pytalhost.com/1955/