My dad recently passed his watch down to me before he passed away. It is a Titoni Cosmo King, purchased when he was in his 30s. The bezel does, unfortunately, show some corrosion on it, as well as scratches to the crystal. The movement also needs servicing.

Is there anyone that can service this watch but keeping most things original? I could always send it to the brands authorised service centres, but I suspect that they would simply replace all parts (if they still produce them) during the service. I would like to preserve the watch as much as I can.

Thanks.