This sign is a Royal warrant of appointment which have been issued for centuries to tradespeople who supply goods or services to a royal court or certain royal personages. The royal warrant enables the supplier to advertise the fact that they supply to the issuer of the royal warrant, so lending prestige to the supplier. Royal families in Europe allow tradesmen to advertise royal patronage.
Royal warrants are typically advertised on company hoardings, letter-heads and products by displaying the coat of arms or the heraldic badge of the royal personage issuing the royal warrant.
This sign belongs to a bakery in Amsterdam.
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