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Hang on to the cap after popping the bubbly

Mr Primault boasts an inventory of more than 30,000 caps, 3,000 of which are pre-1960 - a threshold date between "new" and "old" caps.

Reims, France

YOU may pop open a bottle of champagne to celebrate something good, and perhaps you will keep the painted metal cap which secured the cork as a wee souvenir of that moment.

But for a small but growing number of hobbyists, champagne cap collecting is more than just...

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