1992 30th-anniversary 100W head with channel switching.
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 1992; components only push the date later.
Sold-listing reading: fair $585, good $972, excellent $972 USD · 3 sold listings (thin sample — indicative only) · as of 2026-10-15. thin sample (3 lots, sample_flag thin): three 6100 30th Anniversary heads at 585 / 972 / 1335 USD. All three are Very Good, so fair = sample minimum and good/excellent = sample median by the documented fallback. The '6100 LM' variant (the later, more desirable 1998 revision) is not separated by Reverb's titles here, so it is folded in - worth a later pass with the query 'marshall 6100 lm'. Excluded: a numbered '30th Anniversary Full Stack 1962-1992 #662/1000' head plus two 4x12 anniversary cabs (4453 USD - a stack bundle, not the head), four MPM3E-E/MPM-3E anniversary footswitches (147-195 USD) and a '6100 Anniversary / JCM 900 2000 / JTM 60' Dagnall T5826 transformer (243 USD). The 6100 sits between the JCM 900 4100 (656-1145, 8 lots) and the JCM 800 2203 (1691-4213) - a mid-price 100W head. Alignment verified: PRICE DROP markers at the same three positions (2/3/4) in both arrays. 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; no excellent-condition sale observed; excellent = sample median
Evidence: Blue Book of Guitar Values — marshall · reverb.com