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

I had a pair of modded Dahlquist DQ-10’s That I wish I still had. The tweeters were replaced with a Decca ribbon tweeters and the crossover was updated with better components and the crossover point and roll in slope were changed.

Bought Paradigm Signature S4 twice. They do some things real well. 
 

Others I would consider buying again Tekton DI (although I would likely do Moabs or higher) or Guru QM2 for a smaller 2nd system , or Snell type E lll as they were musical as all get out. For the prices you can sometimes find the Snells for I would consider them being in a garage system (although they deserve better😃)

JBL 4311. 

C.S.I., the soffit or bridge mounts with 2 6" woofers

Road Doublets, owned for nearly 20 years, sold to a friend, bought back, given to son, swapped back.  Eventually replaced with Audio Physic Sitara 25's. Must have bought 6 pairs to replace the Royd's, Monitor Audio, Kef, B+W, Yamaha, even Sonab OA4's, nothing until the AP's sounded right ( they may well have been better just not right)?

Never happened to me. Looks like 2017 was a great year for jasonborne!