NOS (New Old Stock)

NOS stands for New Old Stock — a watch from an older or discontinued production run that has never been sold to an end customer, never been worn, and has remained in its original packaging since the factory. The reference is no longer current production, but the specific watch is, in every meaningful sense, brand new.

What separates NOS from "used in mint condition"

Three things have to be true for a watch to legitimately qualify as NOS:

• Never worn. No wear marks on the lugs, bracelet, or case back. Sometimes the protective stickers are still in place (this overlaps with unworn / stickered condition).
• Never serviced. The movement is exactly as it left the factory. For older mechanical watches this is a double-edged sword. The oils have aged and a service may be needed before regular use.
• Original packaging intact. Box, papers, all accessories — full set status — and ideally the original dealer label or import sticker.

A 1995 Submariner 16610 that was bought in 1995, sat in a safe for thirty years, and surfaces today as a full set with stickers still in place is NOS. The same watch worn occasionally during those years is "mint" or "unworn condition" but not NOS.

Why NOS commands a premium

NOS examples of discontinued references are scarce and time-bound: they cannot be created any more. For collectors building a complete reference set, NOS is the top tier. Auction houses will routinely mark NOS in catalogue descriptions and the premium over a worn full set can be 30 to 100 percent.

Common dealer cautions

Watch out for "NOS" claims on watches that have visible service-replacement parts (service dial, aftermarket bracelet, polished case). True NOS implies that nothing has been touched since manufacture. If parts were replaced, the watch can still be in mint condition but it is not NOS.

Related: unworn, lnib, full-set, discontinued.