There are three approaches you can take when performing your restoration;
The first is a complete refurbish with new materials which ends with a fantastic finish, but can seriously diminish the value of your antique.
The second is a 'soft' restoration, where no new hardware is used, and only what was used in the original construction goes back into it's rebuild. This kind of project is best used on pieces of extreme value, where authenticity is important, but can seriously limit the 'curb appeal' of your trunk.
The third is a moderate restoration, where as much of the original hardware is re-used. Whenever possible, parts from the same period (and preferably manufacturer) are installed and failing that, replaced with new hardware.
I find the third method the most effective since it retains both curb appeal, and attempts to keep the piece as original as possible, however, feel free to use whichever one suits you best.