This model appears to be very hard to come by!
Additional information from Radiomuseum:
Number of Transistors
Semiconductors present.
Semiconductors
Main principle
Superheterodyne (common)
Wave bands
Broadcast (BC) and FM or UHF.
Details
Cassette-Recorder or -Player
Power type and voltage
Line / Batteries (any type) / 240/6 Volt
Loudspeaker
Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
1 W (unknown quality)
Material
Plastics (no bakelite or catalin)
from Radiomuseum.org
Model: National Panasonic RQ-511S - Panasonic, Matsushita,
Shape
Portable set > 8 inch (also usable without mains)
Notes
AM/FM radio cassette.
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