Flat Mandolin, Martin, 1970s, Pickguard needs replacement.

This is likely a Martin mandolin from the 1970s to 1980s. It has a serial number A-254**. I am the original owner. The pickguard needs to be replaced. There is a crack on the upper left shoulder due to age-related deterioration, as shown in the 4th photo. The wood used is the same as the D18 from this era: the body and neck are mahogany, and the fingerboard and headstock are rosewood. There is one pick mark near the bottom of the pickguard. There are also two or three small dings, but otherwise, it is in good condition. Although not tuned, the string height around the center is approximately 1.5mm.
Since Martin has not produced mandolins since 1995, I expect the value to increase in the future. Please feel free to ask any questions or leave comments.