I'm a collector of sorts and I restore my stuff. I'm collecting, not with intent to sell.
If you are selling it the above is good advice except I donlt think new glass would detract from the value as long as the old glass was intact and available to install. and no damage was done when replacing the glass. So that depends on the glass retention method used in your cpmpass.
But if you are going to sell it anyway, it's probably best to leave it alone as advised above.