Provenance, matching numbers, and factory engine restamping

Documentation and originality can add enormous sums (one owner cites Gooding valuing provenance at $500-600k), while the existence of factory-numbered spare engines means a properly restamped replacement is nearly undetectable and not necessarily a detriment. Buyers still scrutinize disclosures on non-matching transmissions, and a German VIN-swapping scandal looms over the market.