Oh! - I would be remiss in not mentioning - the greatest prewar thing I ever (briefly) owned was an E92 Dockman Cy Young. It was raw, and I had no clue what I had. I forget what I paid for it, but it was probably around $500. This was also 20 some years ago. I kept it for awhile, and later sold it in the early days of me having an eBay account. I made maybe a couple hundred bucks on it.
A few months later I was browsing random things - and come across the exact Dockman Young I had - I could tell by the centering and an identifying mark on the back - in a PSA 5 slab. Whoops. I think it sold for more than 2 grand - and again this was forever ago.