A branch mint is a satellite operation of (usually) a national mint. In many cases it will add a mint mark to coins that is different from that used at the main facility, although each country has different rules that may vary over time. Added letters are shown below for the United States, France and Switzerland. Because of this difference, coins produced at branch mints may be worth more or less to collectors than those from the main one, depending on their mintages.[1]
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