A list of my larger collections although there are other random groupings of things probably too small to call a collection:
Ancient antiquities
Ancient and medieval coins
Pre-Colombian artifacts
18th century European, English, and Asian porcelain
Medieval manuscript pages
Cut precious and semi-precious gemstones
Meteorites and tektites
Luxury wristwatches
Original mid-century modern etchings and original art in general
I may have forgotten a couple but it’s difficult to keep track after four decades especially since some collections have been put aside as interests wander. The ones listed above are the ones I’m still actively pursuing and have been doing so the longest.
I also have three classic cars, a ‘64 Porsche 356, a customized ‘78 MGB, and a ‘86 Jaguar XJ6 that‘s my daily driver.
Have also been studying quantum physics for most of my adult life, as a hobby. Numerical Dyslexia kept me out of making it a career choice.