Fleetwood 60s family heirloom

So my uncle bought this about 30 years ago. My dad bought it off him 25 years back.

Had tons if fun drives in this even drove a few weddings myself.

But my dad said its time to sell, any advice on how to do this ?

Not pristine, but very well kept, Never been converted to gas, located in europe.

people have fell of their bike and walked into poles looking at this, never gets dull

Can update with more info