Patek Philippe produce just 40,000, entirely mechanical, hand-made timepieces a year at their Geneva headquarters.
Rolex, by comparison, make around one million.
And the Pateks sell for between £4,000 and £2.
million.
Mr McCourt (32) spent a month in the Swiss city in the company of three Patek employees, who were also taking the course, before he passed the final examination.
He joined the King St jewellers 3 1/2 years ago – Hettich have the sole Channel Islands agency for Patek Philippe products – from a watchmaker in Belfast.
He has also been on courses to qualify to repair Rolex and Cartier watches.
