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.