My fiend's mother had been trying to get rid of her father's stamp collection for years. Her father (H.T.) mostly collected in the early 1950s. He was a merchant marine and bought stamps from every county he visited.
She tried to sell the collection to a dealer in the 80s, but he only offered $20, so she decided to keep the collection to just give to whoever wanted it. My friend told her that I collect stamps, and she offered to give me the collection. What I got were several large boxes stuffed with mostly kiloware, but among all that were hundreds of glassine envelopes filled with some MNH goodies. Some of the envelopes included slips of paper listing how much H.T. paid for the stamps.
Here's a set that H.T. bought in Bermuda in 1951 for $18. They are all never hinged.
