75 W/channel receiver, late 22xx series.
Sold-price reading for this model →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 $200, good $362, excellent $957 USD · 29 sold listings · as of 2012-07 – 2013-12. Classic Receivers eBay SOLD-price table (https://classicreceivers.com/vintage-receiver-values), 29 completed listings; fair/good/excellent here are the observed minimum / median / maximum of those sold prices, not condition grades.
Evidence: AMK Products — Marantz production numbers · Marantz — official site