Flipping refers to the practice of purchasing a watch, typically at retail price from an authorised dealer, and quickly reselling it on the secondary or grey market at a profit. The practice is most common with heavily allocated references — Rolex sport models, Patek Philippe Nautilus and Aquanaut, Audemars Piguet Royal Oak — where secondary market prices trade significantly above retail, creating an immediate arbitrage opportunity for those able to secure a retail purchase.

The activity exists at multiple scales. Individual collectors occasionally sell a piece they have purchased if they change their minds or spot an opportunity; this is generally accepted. At the other extreme, some buyers cultivate dealer relationships specifically to obtain allocated pieces with no intention of keeping them, treating watch retail as a speculative market. This form of flipping is widely condemned in the collecting community and by the brands themselves, both of whom regard it as damaging to genuine collector culture.

Several major brands have taken active steps to discourage flipping. Rolex introduced a two-year resale restriction clause in its authorised dealer agreements in 2020, making it a contractual breach to resell a watch bought at retail within two years of purchase. Patek Philippe monitors secondary market activity and has been known to restrict supply to dealers whose allocation reaches the grey market. The effectiveness of these measures is debated, but they signal a clear brand stance on the issue.