The 100W master-volume JCM 800 — the single most imitated hard-rock head.
Marks that can be entered for this maker: Serial number (plate), Transformer code, Speaker code, Born-on / QA sticker, Panel features (no code).
Nothing predates 1981; components only push the date later.
Sold-listing reading: fair $1,691, good $2,375, excellent $2,584 USD · 10 sold listings · as of 2026-10-14. the filtered page also showed a 'See More' block of other JCM 800 models (2205, 4104 combo, 4210 combo, 1936/1960A/1935A cabinets, 5501 Bass 12, 5005 Lead 12) which belong to other catalogue rows and were not used. One lot is a modded amp (Mike Morin mod) - kept (genuine 2203) but mods affect value. A tenth lot (unmodded 2203 100W head, excellent) was added later from the fallback block of the 'marshall jcm800 1959' query; the two other 2203 heads in that block were already present. Reverb exposes the price and condition but not the exact sale date, so asof = measurement date; no Fair/Poor sale observed; fair = lowest sold price in sample Condition tiers normalised to monotonic order (the source sample had a condition tier below the lower one).
Evidence: Blue Book of Guitar Values — marshall · reverb.com · +1 more