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first a good black beauty is a great shaver!
however! First oil it, open and close the doors and check they do that properly! Check the head alignment. If it is like my slim crooked then do not shave with it, keep it as a reminder or go to a revamp service to repair and revive your dads.
if it works properly clean it as good as you can and use it. It will bite anyhow ;-).
want another variant razor. Parker makes a nice copy of a merkur. Qshave/Weishi does the same for hé merkur futur.
If you have 10 minutes, a butter knife and tape, I can tell you how to straighten that SB on the right side. Bought 2 beautiful challenged Slims that looked just like yours, guess they loved to drop Slims back in the day. I posted way back about how to do it. Very easy but you have to both take it easy and take your time.