Of course the date on a penny is on the same side as Britannia--the
"tail" side. Six pennies may be laid around another penny, all flat on
the table, so that every one of them touches the central one. The number
of threepenny-pieces that may be laid on the surface of a half-crown, so
that no piece lies on another or overlaps the edge of the half-crown, is
one. A second threepenny-piece will overlap the edge of the larger coin.
Few people guess fewer than three, and many persons give an absurdly
high number.