One rule (will be broken within the first five posts I'm sure) is that is not something that can't be sold because of age, usability or non-WUP.
 
IOW, something you have that you love to use and simply can not see EVER getting rid of.
 
I'll start.
 
My '76 Series I Alembic bass.

 That is some mighty fine lookin' driftwood there ;)
 
 A year ago I would say just my 89 PRS, last few months I've been playing only my Spacy made Ophelia and for most of the stuff I like to play, a better neck was never made. Till death do us part

It fits like a glove:
 

 
What's not too love?

I NEVER seen a wall of amps like mine...that go around a corner like this.  This way, it fills the whole room with sound too...even to the corners!  Nice Alembic.  When Stanley Clarke was the bass king, he really propelled those to the spotlight, didn't he?  So...let's see the Ric
 

Something old and something new. My "dog-a-sonic" triple pickup custom, hand built by my (now deceased) dear friend and talented luthier, Tim Qutermous and my recently purchased LTD Edition MIJ Fender 58 Strat. There are others I'd be loathe to part with but could probably be convinced.

And of the scads of guitars I bought, resold or traded throughout these many years (including the 63/64 strat I traded in for a Morley wah wah pedal around 1970 which my best friend then bought for $250...and still has...approx value $5000 to $7000!!!) there is only one that gnaws at me daily: My beloved 1974 Gibson Les Paul deluxe goldtop. I do miss it so.

mike_mccue
It fits like a glove:
 

 
What's not too love?

Since a glove usually goes over the hand...and this fits..    There's something unusual about this...Maybe the seat should be shaped like a hand??

Mixmkr,
 
The Rick is gone, it was traded in with $700 for the Alembic.
 
I want a Rick again but for now I have to do with modeling in the bass on the left (Line 6 Variax):

mike_mccue
It fits like a glove:
 

 
What's not too love?

Latex glove love?

It's some kind of vinyl.
 
They told me it was vegan.

 
 

 
What the? Did you sell the Henley B1 and buy a screen printing shop with the wad of dough?
 
;-)