IMHO it depends on your plans for the jack, if you'll be using it in a car and what to what level the car (if use) will be finished to.
If you want to use it in a restored car then it needs to match the level of completion and condition of the rest of the car
If installing it in an unrestored car don't touch it
If put in a driver and you think it will ever be used you might want to put a different one in the trunk for that purpose.
If you have a restored car another option would be to put this one on a shelf and restore another for use in the car and for shows. Remember that in many settings that neat old sticker and aged condition will cost points. If you don't mind taking a very small "tap on the hand" then that is your choice. Restoring cars is all about choices
There are situations where a part can be "too good" to use
Good luck with what ever path you choose