As a former vintage setup owner, I loved my 530. A couple of years ago, it had some mechanical issues that I thought were fixed. 6 months later, same issue. Frustrated, I decided to go modern with the UltraDeck. I love that table as well, but I missed the automatic features of the 530.
So this summer I took to another shop and had it fixed one last time. I have both tables in my system and just have them take turns.
Your table looks like it’s in fantastic shape and I’m sure you could sell it for somewhere in the $300-$500 range. Maybe more, but since you mentioned mono, it might be easier for you to keep that table because of the removable head shell.
Just some food for thought