Outside of coins & banknotes, I'm a very heavy reader.
I have incredibly varied tastes, but my prized collections are from the Scottish publishers DC Thomson. I have every annual they've produced for the Dandy (1939-ongoing), Beano (1940-ongoing), the Broons & Oor Wullie (1940/39-ongoing, though 4 are modern reprints, I do have the rarest as an original), as well as every spinoff character album, possibly all of their one-shot annuals (There's debate over the existence of one of them. An advert supposedly exists but no-one, not even the publisher's own archive, has a copy of the book), as well as many of their adventure series mainly starting from the 1930s.
The rarest 2-3 books frequently trade at £1,000+, though many 1955 onwards are very affordable.
I also love the proto-superhero / pulp heroes, usually the early 1930s (i.e. pre-Superman). Some are novels, some are comics, many are actually from newspaper strips. Think characters like the Green Hornet & Kato, the Lone Ranger, The Phantom, Doc Savage, The Avenger, Buck Rogers, Mandrake the Magician and my personal top five: Flash Gordon, Dick Tracy, The Shadow, Dan Dare, and my absolute favourite, Zorro!
I do have later comic stuff too of course, the big names like Superman & Batman, assorted Marvel characters, as well things like the Teenage Mutant Ninja Turtles, and Usagi Yojimbo.
In terms of proper books, love my realistic-ish historical character series like Sharpe, Flashman, Macro & Cato, and Hornblower. But can quite happily read just about anything. I struggle with fantasy though; probably requires more imagination than I have. 🙃
Also have every Scarlet Pimpernel book (most people think there's only one story, there's 11(?) full novels, two short-story collections, and 4 spin-off types) which took some finding.
I've usually got 2 non-fiction books, 2 light-reading fiction, 1 “heavy”-reading fiction, and 2 comic-y books on the go at any given moment.
Right now, reading about The Glorious Revolution, and the 1883 Eruption of Krakatoa (which is truly fascinating as with the advent of the telegraph, it was the first global event with (relatively) instant news updates). Fiction is one of the Flashman series (Redskins), and Andy Weir's Artemis (he's the guy who write the Martian, adapted into a film of same name a few years ago), and the original pulp novels of Zorro. Comics are Dick Tracy (just finishing newspaper series for 1944), and a modern Lone Ranger series.
=====
I keep wanting to get into astronomy, but there's light pollution where I am so put it on hold for the most part. It is fascinating though, but doesn't half make me feel small & insignificant!
Flags are also fun, I taught myself all the national flags with an online quiz. Think first time I got maybe 60, now reliably up to 190 & all 197 frequently.
I do wish countries would have a little more imagination. My theory is your flag should:
- Be able to be identified in black & white (my colour vision is very poor, though normal vision is sharp)
- A child would reasonably be able to draw the main components of the design
- Not share the full colour palette with it's immediate neighbours
So many blooming tricolours! 😛
Want a fun flag fact?
The State Flag of Hawai'i is the only one to feature a the UK's Union Jack on it. Despite this, the UK never formally ruled Hawai'i. In simplest terms, the Hawai'ian King basically thought the UK flag was cool & adopted it to show friendship. They eventually realised the nationalistic meaning of flags & combined the UK with the US's stripey colours as a “joint-friendship” between the two nations that visited the most. Obviously, a bit more to it than that, but in a 2 minute nutshell.