Kelleher's upcoming October 20-21 large lot auction has a few large worldwide collections for sale:
Lot 763 is an intact A-Z collection of 200 volumes with an estimated catalog value of $175,000 and a starting bid of $7,500.
Lot 766 is another intact A-Z collection in 250 binders. Sounds like a large collection of common stamps. Starting at $5,000.
Lot is 767 is a massive worldwide dealer stock. 50 moving boxes and a 4-drawer filing cabinet. I assume it's part of low-end stock of Sam Houston Philatelics that Kelleher's is liquidating. I can't even imagine the time it would take to go through all of that. Starting at $5,000.
https://stampauctionnetwork.com//V/v85420.cfm#200