Brand supply discipline
Brands that produce conservatively relative to demand (Rolex, Patek, AP) sustain pricing on the secondary market. Brands that flood inventory or aggressively diversify the catalogue typically don't.
Reference longevity
References produced for decades with only incremental updates (Submariner, Speedmaster Professional, Calatrava) build collector recognition that compounds over time.
Originality
Original dial, hands, bracelet, box and papers all contribute meaningfully to value. Replacement parts during service - even genuine factory parts - typically depress prices on the collector market.
Material
Stainless-steel sport models have outperformed precious-metal equivalents on a percentage basis over recent decades, though precious-metal references retain absolute value better in market downturns.
Provenance
Documented ownership history, particularly for vintage references, can move value substantially. Watches with celebrity or expedition provenance command meaningful premiums at auction.