The very well known Spink & Son is an auction and collectible company known for their sales of coins, banknotes, stock, medals, stamps, etc. Every now and then various auctions keep on taking place. Have a look at the following few of the upcoming auctions at Spinks & Sons.
24th Oct- Revenue Stamps of the world
24th Oct- Bermuda, Crossroads of the Atlantic: A Postal History from 1617 to 1877 - The David Pitts Collection.
25th Oct- The Philatelic Collectors Series Sale.
28th Oct- Fine Stamps and Covers of South East Asia.
30th Oct- The Numismatic Collectors Series Sale.
To know more details about these exhibitions check them here.