Very small, very slim, and very "solid," this was one of Sony's most successful cabinet designs...

Wait, let me take that back: IMHO, this was Sony's MOST successful cabinet design... The TR-63 was a marketing coup, and the TR-610 was, uh, a "paradigm shift" in rethinking transistor cabinet design... But just hold the TR-620 in your hand for five seconds and you'll understand what a little masterpiece of industrial design this radio is...

(...And within the severely blinkered world of collectors:
Since most collectors tend to think merely in terms of rarity, the 620 is often seen and dismissed as an "easy" radio, end of story...)