Be sure the new brasses have the same measurement between
the bore holes as the original.
The boring holes may reveal cotter pin marks. The presence
of these marks is a good indication that the furniture dates
to the William and Mary Period.
The lines of the original brasses may be discovered from
the shadow of the backplate embedded in the wood.
Reproduction brasses should be chosen to closely match the
original.
Check the escutcheon against the handle design. Handles
wear out before keyholes. If the handles and the keyholes
don't match, use the keyhole as the indication of the age
of the piece.
Look at the back of the bail handle for a signature. A collector
will date an antique by using the maker's name. The ends
of the balls also indicate age. If the ends are square,
they are hand-made. Round-ended balls usually indicate they
were machined.
The screws should also be examined. If they are like flat
tires, they were hand made sometime before 1800. If the
nut is attached to the washer, they were probably made in
the Victorian period.
Before 1750, brasses were light in color because they had
a large content of zinc and tin. After 1750, hardware became
much darker because copper was mixed in.