Obverse is the head of the coin. See the related link.
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The obverse side of a coin - is the side with The Queen's head
on it.
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All US half dollars intended for circulation have a person on
the obverse. Prior to 1948 it had a personification of Liberty on
the obverse. From 1948-1963 it had Benjamin Franklin on the
obverse. From 1964-present it features John F. Kennedy on the
obverse.
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"Obverse" refers to the front of the coin (usually the side with
the portrait), as versus the "reverse", or back, of the coin.