Marantz's tube-era reference tuner (1964) and still one of the most collectable FM tuners ever built.
Tube chassis: lethal B+ voltages remain after switch-off — discharge before service. Never power up an unrestored unit on original electrolytics. Serial tag is an ink stamp on a plastic label (often missing/faded); the value depends on original transformers (replaced/rewound iron cuts price sharply).
Marks that can be entered for this maker: Serial number, Model / catalogue number, British capacitor code (Hunts, Mullard), Japanese capacitor code (Nichicon, Chemi-Con, ELNA), EIA component code, Chassis / platter stamp, Version & era marker.
Nothing predates 1964; components only push the date later.
Sold-listing reading: fair $3,050, good $3,050, excellent $3,050 USD · 1 sold listings (thin sample — indicative only) · as of 2013-01 – 2013-01. Only 1 sold listing(s) found in the eBay SOLD table (['2013-01-14'], https://classicreceivers.com/vintage-receiver-values — below the 3-observation threshold), so the price is an estimate/anchor, not a market average.
Evidence: Marantz — official site · AMK Products — Marantz production numbers