It’s probably easiest to simply replace the movement. A vr3235 costs around $100 on AliExpress. Be sure to buy the correct version: there’s a DJ and Sub version with different sized date discs. You’ll want to get the Sub version. A movement swap isn’t too hard if you have some basic tools (tweezers, screw drivers, hand pressing tool, flush cutters for trimming the stem, and loctite). But even if you get a watchmaker to do it for you it’ll be cheaper than getting the watchmaker to restore your rusted movement.