COPENHAGEN — It was meant to be a collector’s secret, but someone knew the secret, stole the secret and, it seems, drank the secret: what the owner calls “the most expensive vodka bottle in the world.”

The bottle was created by Dartz Motorz, a car manufacturer in Riga, Latvia, and fitted with an original 1912 leather ribbon from the company’s first Monte Carlo rally car.

The bottle is made of 6.6 pounds of gold and the equivalent amount of silver and has a diamond-encrusted cap fashioned to resemble a vintage car front.

It had been borrowed and placed in a pub, Cafe 33, in central Copenhagen amid a collection of fine spirits assembled by Brian Ingberg, the bar’s owner.