Repairs on a rangefinder Canon

The Photo Historical society that I serve has had a donation of a fairly rare Canon S we will want to auction off. In these cases, we take a percentage of the eventual price and give a portion back to the donor. Collectiblend has this particular model worth well over $4k in average shape. Right now, it's a bit rough but fixable. Can anyone suggest a repair shop for Canon rangefinders that might be a good place to have this one overhauled? I think the value of the camera to collectors will make it worth our while to fix it up a bit before it goes on the block.

Function, cosmetics, or both?

Youxin Ye is very well regarded, at least from a "function" standpoint.

Sometimes collectors prefer particularly rare items left as is rather than fixed up.

It's actually missing some parts (something I didn't know when first posting). Here is a snap of the top:

Looks like it's in the "restoration" category.