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According to numerous newsgroup posts, 564 in the model number indicates that it was made by Sanyo.
I agree that it looks old fashioned for 1971. It's possible that the Sams wasn't published for a couple of years after the set was made. Can you see any date codes? Is it all tube, or a hybrid? I have 2 early 70's Sanyo color portables (one branded Sears) and they are both hybrids with solid state tuner, IF, chroma, most of the luma, and audio.
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