I was an avid stamp collector as a kid, I had my great grandmothers collection from Germany and several generations of stamps, 5 or 6 plate block books overflowing from the 40's to 90s. I had all the color gauges, perf gauges, watermark fluid, everything.
My 16 year old self would have bought that whole collection and spent hours and hours and hours sorting through it.
Good memories. Good luck with the sale!
There are probably a few keeper in that but many alone likely aren't worth much, but to a philatelist, it's a gold mine!