The largest teapot collection is owned by an LA couple, Sonny & Gloria Kamm, who have been collecting for over 35 years. Their collection numbers over 17,000 items and has its own Foundation to organize and preserve it. Read about the Kamm Teapot Foundation.
The Most expensive teapot ever sold is actually a pair of melon teapots that sold at auction in 20ll for 2.8 million dollars. They look like little pumpkins. Read more here.
The oldest known teapot was made in China (no surprise there) in 1533. Read more here.
And finally, one more....
Well I'll leave it here as this list could go on for several weeks. One thing I found while researching this post was that there are always several claims to the biggest, smallest, oldest, best, etc. Man's search for fame? Anyway, I picked what I considered to be the most credible info. Happy T Day and happy reading.