Welcome to the board.
Your question has been addressed countless times- what it comes down to is- it is up to you.
Breaking a numbered part will reduce its value, but if you inherited it- it was free- so not a big issue.
It would be worth more to you as a family related item than anyone else, JMHO.
If the striker(firing pin) also has a small eagle/6 stamped on it, it may be an original Simson part.
If not, it has already been replaced once.
Some folks worry a lot about "breaking" a luger, I don't, if you use regular 115 gr ammo, not +P and not Nato, I would shoot it.
The parts that break more often- but not really often:
ejector
extractor
striker
On a Simson they would all have the small e/6 - parts which are hard to find.
You could always buy spares and replace them before you shoot.
Do a search for shooting my luger, and read all the opinions.
Everyone has one, and they are usually different!
The safest way is to buy a shooter luger and shoot it!
By the way, there are no pictures in your post.