Offer / counter-offer? Audiogon rules

I would simply write and ask if they want the piece, and if they still want it for their offered price. 

You could say you realized you were being needlessly rigid.

Get ready. If you contact him again saying you’ll accept the original offer, 100$ says he offers less the second time. He’ll think you’re desperate. Good luck 

Fishing is a tough business.  It's a big ocean and fish can be hard to find.  Once you get one on the line, get him into the boat then you're done.  Let him get away and you don't know when the next one is going to come along, and it's just as likely as not that it will be smaller.

You have to ask yourself:
"Do I want a sale bad enough to accept an offer?
Or would I rather squeeze the lemon and possibly blow up any sale?"
Strictly either/or.

Nice fish story.

Once an offer is declined there’s no more offer