What
may be reasonable to you as a seller may not be reasonable to others
as buyers. While you may "have a fair idea of the market value",
interested buyers may not.

Sure thing. For me, $20 is reasonable, since that is about how much fun I
would have
getting an old radio working and pretending it was 1930 to see what I could
hear. And then sitting it under the bench to put my dirty boots on.

On the other hand to someone else that radio might be worth $500 because it
is just exactly what he needs to complete his collection and besides that
he never saw three of them sitting on the bench side by side.

It all depends........

So give at least a starting price if you are going to accept bids.

Rick K2XT