What piece(s) of gear did you sell/give away that you would like to have back?


We've all done it - sold or traded a piece of gear we had fallen out of love with, then regretted that decision at some point. If you could go back in time, but could only retrieve one piece, what would that be?
discnik
Precision Fidelity C7 tube phono stage. Designed by Bruce Moore (MFA and Paragon). Advanced cascode circuit design using 12AX7's. A pair of potentiometers and a selector switch on the front so it can be connected directly to an amp. Bought it new for $500 from American Audiophile on 61st and Madison, NYC in '79. Stupidly sold it a few years later for half-price for some fast cash!
My first pair of Quad 57's, which I had in use from '81 to 2000 - 19 years! Again a stupid sale when I needed some fast cash!
I bet the introduction of CDs in the early 80s had some influence on your decision to sell the Precision Fidelity phonostage, roberjerman? That sounds like it was a very nice unit. $500 seems like a pittance these days, but it was big money in 1979.
2016 My stored system got nicked.. C22, 2 MC240, TT, SS Amp, 3 way  tube crossover, a footlocker of OLD valves, on and on, and on.. 

I wish I wouldn't have sold them to the insurance company, BUT I didn't have a choice, at the time.. 43K in insurance and I'm still hunting up parts.

Could have been worse, no insurance or no replacement value..

Regards
Sellers remorse? Nah man, alien concept. If it's worth keeping why would I sell it? Unless hard up for cash, which to me would be such a painful lesson it would never be repeated ever again. Like the one time I had a Yamaha RD-350 and a Datsun 240Z and after college I was broke and sold the Yamaha for like $800.

Then 20 years later Motorcycle has an article on vintage bikes and there is my exact RD-350 same color and everything only now worth ten grand!?! WTF!??!   

Learned that lesson. Still have my 1979 911 SC. Now worth twice what I paid for it. More than twice. Shop critically, buy wisely, sell rarely. Only way to go.