Restoring a ref. 166.027?

This 120 is in what the seller swears is 'good working order'. Anyone have thoughts as to what a proper restoration, not a hodge-podge job, might end up costing? Auction piece so I can't see much else, but IF I decide to go for it, I'd like to leave enough room to bring it properly and fully back to life, not just mod it into service wear. Replacing bits and pieces I'm used to on more modern pieces, but this would be my first full resto job. That is if it needs much beyond the general service and a proper bezel; I've wanted a true 60s 120M for ages but aren't too familiar with them outside of online reading.