It is just the way they made those back then.
Try not to let it bother you, or if it makes you that unhappy just use it till you either decide to change it or you may find it doesn't matter.
The tilt was for two purposes, one was bench clearance and the other was to keep the case biased back on the shell plate clearance.
Both issues are a "salt to taste" design parameter and make some folks happy and others don't care.
It looks like it has been very lightly used and in good shape. You should not let it bug you. YMMV