So I was reading further and the grey family made some Minerva’s 3 handers with display caseback from circa 1997-2000. But this is the only one kn 36 mm So that makes it a little extra special.
Not normal for the date to jump when pulling out the crown. You can try letting the power run down and then rotating the hands for 48 hours to have the date change they way. That sometimes solves date wheel/ hear issues. If not, I suggest taking back to your AD to check.