The dividing lines between maintenance, conservation, preservation, and restoration are very thin. So are the definitions
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Every dagger worth owning is at least 66 years old and probably more like 70-75 years old. Without some form of past help, almost every one would be in poor shape today. I agree with john about the green gunk that forms under leather. I keep my leather hangers separate and use wax or shoe polish on them from time to time since leather deteriorates. I also use wax on wooden grips to clean them.
Tell us which type of dagger you have in mind and we can probably tell you more.
Dave
