What speakers have you mistakenly let go and then later repurchased?

Never sold a a pair.  However, I have upgraded with three successive pairs of

Magnepans.  Love them all.  

Thiel CS something or other, but really good

Tonian Labs TL D-1

Owned a pair, sold them, then missed them. Then bought another pair. If they would have went a little louder without breakup. I would have never sold them.

Harbeth P3esr in my second system. There was something unassuming yet special about the speakers. I’ll probably buy another pair next year. 

spendor sp100's - but i did manage to get the back in the fold... 😁