Chris,

Very nice looking case for your rifle.

While most cases have a tie down wrist strap, I have seen a few without the strap.

Matching 100 year old felt will be an issue as cloth changes from dye lot to dye lot and of course, changes with age.

I think you have to take your case into a craft store and buy the closest felt which you might be able to dye to a closer match. I have seen cases that there is a slight difference in felt color which likely is due to a repair.

The only other option that I know people do is replace all the felt. However, your felt looks good and that likely isn't a practical option.