Not really obscure, but I have a copy of a couple of Indian printed (pirate!) copies of books I bought in a bookshop in Kathmandu:

The Tibetan Book of the Dead

The Ascent of Rum Doodle

My Dad has a lot of old late 1800s early 1900 books including a huge 2 volume dictionary, which is actually more of an encyclopaedia. It has topic sections like "How to defend yourself from savages" or "How to dig your own coal mine" etc.

I own a book by Joseph Altsheler, The Forest Runners. I believe it was published in the 1930s. It's written for boys.

My dad owns a rare Buddy Hall biography called Rags to Rifleman. Buddy Hall is one of the greatest pool players ever to live.

I have a bunch of first edition magazines. Too many to list here. Collecting was easy. I was in bookstores, and figured that any first edition was worth the nominal price.

If anyone's interested,

https://rentry.co/23pbcaef

Some Persian fairy tales dated about 1850

Miss Marjoribanks volume 2

The Kybalion by Three Initiates

Almost nobody has it but that's kinda part of how it's supposed to be.