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COSC Certification

COSC Certification Explained: What It Means for Your Watch

Chronometer. The word appears on more watch dials than almost any other technical designation. Rolex prints it across the Submariner’s dial. Tudor uses it on the Black Bay line. Omega’s Master Chronometer standard takes it further. But what does the designation actually require, who tests...

COSC Certification

Certified Pre-Owned vs Grey Market Watches Explained

You have found the watch you want. Now someone is offering it to you through a certified pre-owned programme at one price, and a grey market dealer is offering it for less. Before you decide which route to take, you need to understand what each...

Mayfair Fine Jewellery