120 W/channel stereo power unit, first Marantz power unit after the tube era.
Solid-state: check autoformer/Power Guard boards and the original output devices; re-professional recap is expected at this age.
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.
The introduction year is not documented, so the model narrows nothing.
Sold-listing reading: fair $163, good $221, excellent $280 USD · 2 sold listings (thin sample — indicative only) · as of 2013-12 – 2013-12. Only 2 sold listing(s) found in the eBay SOLD table (['2013-12-09', '2013-12-10'], https://classicreceivers.com/vintage-receiver-values — below the 3-observation threshold), so the price is an estimate/anchor, not a market average.